5283 lines
210 KiB
C++
5283 lines
210 KiB
C++
/* -------------------------------------------------------------------------
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*
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* rewriteHandler.cpp
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* Primary module of query rewriter.
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*
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* Portions Copyright (c) 2020 Huawei Technologies Co.,Ltd.
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/gausskernel/optimizer/rewrite/rewriteHandler.cpp
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*
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "knl/knl_variable.h"
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#include "access/sysattr.h"
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#include "catalog/gs_matview_dependency.h"
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#include "catalog/gs_matview.h"
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#include "catalog/pg_type.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_proc.h"
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#include "commands/trigger.h"
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#include "commands/matview.h"
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#include "commands/sequence.h"
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#include "commands/tablecmds.h"
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#include "executor/executor.h"
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#include "foreign/fdwapi.h"
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#include "nodes/makefuncs.h"
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#include "nodes/nodeFuncs.h"
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#include "optimizer/clauses.h"
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#include "parser/analyze.h"
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#include "parser/parse_coerce.h"
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#include "parser/parsetree.h"
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#include "parser/parse_merge.h"
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#include "parser/parse_hint.h"
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#include "parser/parse_type.h"
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#include "rewrite/rewriteDefine.h"
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#include "rewrite/rewriteHandler.h"
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#include "rewrite/rewriteManip.h"
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#include "rewrite/rewriteRlsPolicy.h"
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#include "utils/builtins.h"
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#include "utils/bytea.h"
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#include "utils/lsyscache.h"
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#include "utils/rel.h"
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#include "utils/rel_gs.h"
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#include "catalog/pg_constraint.h"
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#include "catalog/namespace.h"
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#include "client_logic/client_logic.h"
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#include "catalog/pg_proc.h"
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#include "commands/sqladvisor.h"
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#ifdef PGXC
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#include "pgxc/locator.h"
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#include "pgxc/nodemgr.h"
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#include "pgxc/pgxc.h"
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#include "nodes/nodes.h"
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#include "optimizer/planner.h"
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#include "optimizer/var.h"
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#include "tcop/tcopprot.h"
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#include "tcop/utility.h"
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#ifdef ENABLE_MULTIPLE_NODES
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#include "tsdb/utils/ts_redis.h"
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#endif
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#endif
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/* We use a list of these to detect recursion in RewriteQuery */
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typedef struct rewrite_event {
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Oid relation; /* OID of relation having rules */
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CmdType event; /* type of rule being fired */
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} rewrite_event;
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static bool acquireLocksOnSubLinks(Node* node, void* context);
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static Query* rewriteRuleAction(
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Query* parsetree, Query* rule_action, Node* rule_qual, int rt_index, CmdType event, bool* returning_flag);
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static List* adjustJoinTreeList(Query* parsetree, bool removert, int rt_index);
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static List *rewriteTargetListIU(List *targetList, CmdType commandType, Relation target_relation, int result_rtindex,
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List **attrno_list, bool *hasGenCol);
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static TargetEntry* process_matched_tle(TargetEntry* src_tle, TargetEntry* prior_tle, const char* attrName);
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static Node* get_assignment_input(Node* node);
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static bool rewriteValuesRTE(Query* parsetree, RangeTblEntry* rte, Relation target_relation, List* attrnos,
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bool force_nulls);
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static void rewriteTargetListUD(Query* parsetree, RangeTblEntry* target_rte, Relation target_relation, int rtindex);
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static void rewriteTargetListMutilUD(Query* parsetree, List* rtable, List* resultRelations);
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static void rewriteTargetListMutilUpdate(Query* parsetree, List* rtable, List* resultRelations);
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static void markQueryForLocking(Query* qry, Node* jtnode, LockClauseStrength strength, LockWaitPolicy waitPolicy, bool pushedDown,
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int waitSec);
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static List* matchLocks(CmdType event, RuleLock* rulelocks, int varno, Query* parsetree);
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static Query* fireRIRrules(Query* parsetree, List* activeRIRs, bool forUpdatePushedDown);
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static Bitmapset* adjust_view_column_set(Bitmapset* cols, List* targetlist);
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static bool findAttrByName(const char* attributeName, List* tableElts, int maxlen);
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#ifdef PGXC
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typedef struct pull_qual_vars_context {
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List* varlist;
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int sublevels_up;
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int resultRelation;
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bool noRepeat;
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} pull_qual_vars_context;
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static bool pull_qual_vars_walker(Node* node, pull_qual_vars_context* context);
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#endif
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/*
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* AcquireRewriteLocks -
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* Acquire suitable locks on all the relations mentioned in the Query.
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* These locks will ensure that the relation schemas don't change under us
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* while we are rewriting and planning the query.
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*
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* forUpdatePushedDown indicates that a pushed-down FOR UPDATE/SHARE applies
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* to the current subquery, requiring all rels to be opened with RowShareLock.
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* This should always be false at the start of the recursion.
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*
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* Caution: A secondary purpose of this routine is to fix up JOIN RTE references
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* to dropped columns (see details below). Because the RTEs are modified in
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* place, it is generally appropriate for the caller of this routine to have
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* first done a copyObject() to make a writable copy of the querytree in the
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* current memory context.
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*
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* This processing can, and for efficiency's sake should, be skipped when the
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* querytree has just been built by the parser: parse analysis already got
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* all the same locks we'd get here, and the parser will have omitted dropped
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* columns from JOINs to begin with. But we must do this whenever we are
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* dealing with a querytree produced earlier than the current command.
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*
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* About JOINs and dropped columns: although the parser never includes an
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* already-dropped column in a JOIN RTE's alias var list, it is possible for
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* such a list in a stored rule to include references to dropped columns.
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* (If the column is not explicitly referenced anywhere else in the query,
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* the dependency mechanism won't consider it used by the rule and so won't
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* prevent the column drop.) To support get_rte_attribute_is_dropped(),
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* we replace join alias vars that reference dropped columns with NULL Const
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* nodes.
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*
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* (In PostgreSQL 8.0, we did not do this processing but instead had
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* get_rte_attribute_is_dropped() recurse to detect dropped columns in joins.
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* That approach had horrible performance unfortunately; in particular
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* construction of a nested join was O(N^2) in the nesting depth.)
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*/
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void AcquireRewriteLocks(Query* parsetree, bool forUpdatePushedDown)
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{
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ListCell* l = NULL;
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int rt_index;
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/*
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* First, process RTEs of the current query level.
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*/
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rt_index = 0;
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foreach (l, parsetree->rtable) {
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RangeTblEntry* rte = (RangeTblEntry*)lfirst(l);
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Relation rel;
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LOCKMODE lockmode;
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List* newaliasvars = NIL;
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Index curinputvarno;
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RangeTblEntry* curinputrte = NULL;
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ListCell* ll = NULL;
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++rt_index;
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switch (rte->rtekind) {
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case RTE_RELATION:
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/*
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* Grab the appropriate lock type for the relation, and do not
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* release it until end of transaction. This protects the
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* rewriter and planner against schema changes mid-query.
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*
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* If the relation is the query's result relation, then we
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* need RowExclusiveLock. Otherwise, check to see if the
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* relation is accessed FOR [KEY] UPDATE/SHARE or not. We can't
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* just grab AccessShareLock because then the executor would
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* be trying to upgrade the lock, leading to possible
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* deadlocks.
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*/
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if (rt_index == linitial2_int(parsetree->resultRelations))
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lockmode = RowExclusiveLock;
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else if (forUpdatePushedDown || get_parse_rowmark(parsetree, rt_index) != NULL)
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lockmode = RowShareLock;
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else
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lockmode = AccessShareLock;
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rel = heap_open(rte->relid, lockmode);
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/*
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* While we have the relation open, update the RTE's relkind,
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* just in case it changed since this rule was made.
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*/
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rte->relkind = rel->rd_rel->relkind;
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heap_close(rel, NoLock);
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break;
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case RTE_JOIN:
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/*
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* Scan the join's alias var list to see if any columns have
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* been dropped, and if so replace those Vars with NULL
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* Consts.
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*
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* Since a join has only two inputs, we can expect to see
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* multiple references to the same input RTE; optimize away
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* multiple fetches.
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*/
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newaliasvars = NIL;
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curinputvarno = 0;
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curinputrte = NULL;
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foreach (ll, rte->joinaliasvars) {
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Var* aliasvar = (Var*)lfirst(ll);
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/*
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* If the list item isn't a simple Var, then it must
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* represent a merged column, ie a USING column, and so it
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* couldn't possibly be dropped, since it's referenced in
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* the join clause. (Conceivably it could also be a NULL
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* constant already? But that's OK too.)
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*/
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if (IsA(aliasvar, Var)) {
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/*
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* The elements of an alias list have to refer to
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* earlier RTEs of the same rtable, because that's the
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* order the planner builds things in. So we already
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* processed the referenced RTE, and so it's safe to
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* use get_rte_attribute_is_dropped on it. (This might
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* not hold after rewriting or planning, but it's OK
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* to assume here.)
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*/
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AssertEreport(aliasvar->varlevelsup == 0, MOD_OPT, "");
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if (aliasvar->varno != curinputvarno) {
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curinputvarno = aliasvar->varno;
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curinputrte = rt_fetch(curinputvarno, parsetree->rtable);
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}
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if (curinputrte != NULL && get_rte_attribute_is_dropped(curinputrte, aliasvar->varattno)) {
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/*
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* can't use vartype here, since that might be a
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* now-dropped type OID, but it doesn't really
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* matter what type the Const claims to be.
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*/
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aliasvar = (Var*)makeNullConst(INT4OID, -1, InvalidOid);
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}
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}
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newaliasvars = lappend(newaliasvars, aliasvar);
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}
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rte->joinaliasvars = newaliasvars;
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break;
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case RTE_SUBQUERY:
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/*
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* The subquery RTE itself is all right, but we have to
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* recurse to process the represented subquery.
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*/
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AcquireRewriteLocks(
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rte->subquery, (forUpdatePushedDown || get_parse_rowmark(parsetree, rt_index) != NULL));
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break;
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default:
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/* ignore other types of RTEs */
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break;
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}
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}
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/* Recurse into subqueries in WITH */
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foreach (l, parsetree->cteList) {
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CommonTableExpr* cte = (CommonTableExpr*)lfirst(l);
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AcquireRewriteLocks((Query*)cte->ctequery, false);
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}
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/*
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* Recurse into sublink subqueries, too. But we already did the ones in
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* the rtable and cteList.
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*/
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if (parsetree->hasSubLinks)
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(void)query_tree_walker(parsetree, (bool (*)())acquireLocksOnSubLinks, NULL, QTW_IGNORE_RC_SUBQUERIES);
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}
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/*
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* Walker to find sublink subqueries for AcquireRewriteLocks
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*/
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static bool acquireLocksOnSubLinks(Node* node, void* context)
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{
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if (node == NULL)
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return false;
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if (IsA(node, SubLink)) {
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SubLink* sub = (SubLink*)node;
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/* Do what we came for */
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AcquireRewriteLocks((Query*)sub->subselect, false);
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/* Fall through to process lefthand args of SubLink */
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}
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/*
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* Do NOT recurse into Query nodes, because AcquireRewriteLocks already
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* processed subselects of subselects for us.
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*/
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return expression_tree_walker(node, (bool (*)())acquireLocksOnSubLinks, context);
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}
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/*
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* Walker to pass down views' invoker info to RangeTableEnrty or FuncExpr in a Query
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* B format mode use this feature
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*/
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static bool viewSecurityPassDown(Node* node, void* context)
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{
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Oid* asUser = (Oid*)context;
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if (node == NULL)
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return false;
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if (IsA(node, RangeTblEntry)) {
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RangeTblEntry* rte = (RangeTblEntry*)node;
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/* Do what we came for */
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if (rte->rtekind == RTE_RELATION) {
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rte->checkAsUser = *asUser;
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/* Check namespace permissions. */
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AclResult aclresult;
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/* No lock here ,cause relation already opend */
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Relation rel = heap_open(rte->relid, NoLock);
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Oid namespaceId = RelationGetNamespace(rel);
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aclresult = pg_namespace_aclcheck(namespaceId, *asUser, ACL_USAGE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE, get_namespace_name(namespaceId));
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heap_close(rel, NoLock);
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}
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/* allow rangetable entry continue */
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return false;
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}
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/*
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* Do NOT recurse into Query nodes, because fireRIRrules already processed
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* subselects of subselects for us.
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*/
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return expression_tree_walker(node, (bool (*)())viewSecurityPassDown, context);
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}
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/*
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* rewriteRuleAction -
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* Rewrite the rule action with appropriate qualifiers (taken from
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* the triggering query).
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*
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* Input arguments:
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* parsetree - original query
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* rule_action - one action (query) of a rule
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* rule_qual - WHERE condition of rule, or NULL if unconditional
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* rt_index - RT index of result relation in original query
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* event - type of rule event
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* Output arguments:
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* *returning_flag - set TRUE if we rewrite RETURNING clause in rule_action
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* (must be initialized to FALSE)
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* Return value:
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* rewritten form of rule_action
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*/
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static Query* rewriteRuleAction(
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Query* parsetree, Query* rule_action, Node* rule_qual, int rt_index, CmdType event, bool* returning_flag)
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{
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int current_varno, new_varno;
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int rt_length;
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Query* sub_action = NULL;
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Query** sub_action_ptr;
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/*
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* Make modifiable copies of rule action and qual (what we're passed are
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* the stored versions in the relcache; don't touch 'em!).
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*/
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rule_action = (Query*)copyObject(rule_action);
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rule_qual = (Node*)copyObject(rule_qual);
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/*
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* Acquire necessary locks and fix any deleted JOIN RTE entries.
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*/
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AcquireRewriteLocks(rule_action, false);
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(void)acquireLocksOnSubLinks(rule_qual, NULL);
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current_varno = rt_index;
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rt_length = list_length(parsetree->rtable);
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new_varno = PRS2_NEW_VARNO + rt_length;
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/*
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* Adjust rule action and qual to offset its varnos, so that we can merge
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* its rtable with the main parsetree's rtable.
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*
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* If the rule action is an INSERT...SELECT, the OLD/NEW rtable entries
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* will be in the SELECT part, and we have to modify that rather than the
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* top-level INSERT (kluge!).
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*/
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sub_action = getInsertSelectQuery(rule_action, &sub_action_ptr);
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OffsetVarNodes((Node*)sub_action, rt_length, 0);
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OffsetVarNodes(rule_qual, rt_length, 0);
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/* but references to OLD should point at original rt_index */
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ChangeVarNodes((Node*)sub_action, PRS2_OLD_VARNO + rt_length, rt_index, 0);
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ChangeVarNodes(rule_qual, PRS2_OLD_VARNO + rt_length, rt_index, 0);
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/*
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* Generate expanded rtable consisting of main parsetree's rtable plus
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* rule action's rtable; this becomes the complete rtable for the rule
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* action. Some of the entries may be unused after we finish rewriting,
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* but we leave them all in place for two reasons:
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*
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* We'd have a much harder job to adjust the query's varnos if we
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* selectively removed RT entries.
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*
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* If the rule is INSTEAD, then the original query won't be executed at
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* all, and so its rtable must be preserved so that the executor will do
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* the correct permissions checks on it.
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*
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* RT entries that are not referenced in the completed jointree will be
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* ignored by the planner, so they do not affect query semantics. But any
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* permissions checks specified in them will be applied during executor
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* startup (see ExecCheckRTEPerms()). This allows us to check that the
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* caller has, say, insert-permission on a view, when the view is not
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* semantically referenced at all in the resulting query.
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*
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* When a rule is not INSTEAD, the permissions checks done on its copied
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* RT entries will be redundant with those done during execution of the
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* original query, but we don't bother to treat that case differently.
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*
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* NOTE: because planner will destructively alter rtable, we must ensure
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* that rule action's rtable is separate and shares no substructure with
|
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* the main rtable. Hence do a deep copy here.
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*/
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sub_action->rtable = list_concat((List*)copyObject(parsetree->rtable), sub_action->rtable);
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/*
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* There could have been some SubLinks in parsetree's rtable, in which
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* case we'd better mark the sub_action correctly.
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*/
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if (parsetree->hasSubLinks && !sub_action->hasSubLinks) {
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ListCell* lc = NULL;
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foreach (lc, parsetree->rtable) {
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RangeTblEntry* rte = (RangeTblEntry*)lfirst(lc);
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switch (rte->rtekind) {
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case RTE_RELATION:
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sub_action->hasSubLinks = checkExprHasSubLink((Node*)rte->tablesample)
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|| checkExprHasSubLink((Node*)rte->timecapsule);
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break;
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case RTE_FUNCTION:
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sub_action->hasSubLinks = checkExprHasSubLink(rte->funcexpr);
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break;
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case RTE_VALUES:
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sub_action->hasSubLinks = checkExprHasSubLink((Node*)rte->values_lists);
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break;
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default:
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/* other RTE types don't contain bare expressions */
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break;
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}
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if (sub_action->hasSubLinks)
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break; /* no need to keep scanning rtable */
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}
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}
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/*
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* Also, we might have absorbed some RTEs with RLS conditions into the
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* sub_action. If so, mark it as hasRowSecurity, whether or not those
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* RTEs will be referenced after we finish rewriting. (Note: currently
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* this is a no-op because RLS conditions aren't added till later, but it
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* seems like good future-proofing to do this anyway.)
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*/
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sub_action->hasRowSecurity = (sub_action->hasRowSecurity || parsetree->hasRowSecurity);
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/*
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* Each rule action's jointree should be the main parsetree's jointree
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* plus that rule's jointree, but usually *without* the original rtindex
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* that we're replacing (if present, which it won't be for INSERT). Note
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* that if the rule action refers to OLD, its jointree will add a
|
|
* reference to rt_index. If the rule action doesn't refer to OLD, but
|
|
* either the rule_qual or the user query quals do, then we need to keep
|
|
* the original rtindex in the jointree to provide data for the quals. We
|
|
* don't want the original rtindex to be joined twice, however, so avoid
|
|
* keeping it if the rule action mentions it.
|
|
*
|
|
* As above, the action's jointree must not share substructure with the
|
|
* main parsetree's.
|
|
*/
|
|
if (sub_action->commandType != CMD_UTILITY) {
|
|
bool keeporig = false;
|
|
List* newjointree = NIL;
|
|
|
|
AssertEreport(sub_action->jointree != NULL, MOD_OPT, "");
|
|
keeporig = (!rangeTableEntry_used((Node*)sub_action->jointree, rt_index, 0)) &&
|
|
(rangeTableEntry_used(rule_qual, rt_index, 0) ||
|
|
rangeTableEntry_used(parsetree->jointree->quals, rt_index, 0));
|
|
newjointree = adjustJoinTreeList(parsetree, !keeporig, rt_index);
|
|
if (newjointree != NIL) {
|
|
/*
|
|
* If sub_action is a setop, manipulating its jointree will do no
|
|
* good at all, because the jointree is dummy. (Perhaps someday
|
|
* we could push the joining and quals down to the member
|
|
* statements of the setop?)
|
|
*/
|
|
if (sub_action->setOperations != NULL)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented")));
|
|
|
|
sub_action->jointree->fromlist = list_concat(newjointree, sub_action->jointree->fromlist);
|
|
|
|
/*
|
|
* There could have been some SubLinks in newjointree, in which
|
|
* case we'd better mark the sub_action correctly.
|
|
*/
|
|
if (parsetree->hasSubLinks && !sub_action->hasSubLinks)
|
|
sub_action->hasSubLinks = checkExprHasSubLink((Node*)newjointree);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the original query has any CTEs, copy them into the rule action. But
|
|
* we don't need them for a utility action.
|
|
*/
|
|
if (parsetree->cteList != NIL && sub_action->commandType != CMD_UTILITY) {
|
|
ListCell* lc = NULL;
|
|
|
|
/*
|
|
* Annoying implementation restriction: because CTEs are identified by
|
|
* name within a cteList, we can't merge a CTE from the original query
|
|
* if it has the same name as any CTE in the rule action.
|
|
*
|
|
* This could possibly be fixed by using some sort of internally
|
|
* generated ID, instead of names, to link CTE RTEs to their CTEs.
|
|
*/
|
|
foreach (lc, parsetree->cteList) {
|
|
CommonTableExpr* cte = (CommonTableExpr*)lfirst(lc);
|
|
ListCell* lc2 = NULL;
|
|
|
|
foreach (lc2, sub_action->cteList) {
|
|
CommonTableExpr* cte2 = (CommonTableExpr*)lfirst(lc2);
|
|
|
|
if (strcmp(cte->ctename, cte2->ctename) == 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("WITH query name \"%s\" appears in both a rule action and the query being rewritten",
|
|
cte->ctename)));
|
|
}
|
|
}
|
|
|
|
/* OK, it's safe to combine the CTE lists */
|
|
sub_action->cteList = list_concat(sub_action->cteList, (List*)copyObject(parsetree->cteList));
|
|
}
|
|
|
|
/*
|
|
* Event Qualification forces copying of parsetree and splitting into two
|
|
* queries one w/rule_qual, one w/NOT rule_qual. Also add user query qual
|
|
* onto rule action
|
|
*/
|
|
AddQual(sub_action, rule_qual);
|
|
|
|
AddQual(sub_action, parsetree->jointree->quals);
|
|
|
|
/*
|
|
* Rewrite new.attribute with right hand side of target-list entry for
|
|
* appropriate field name in insert/update.
|
|
*
|
|
* KLUGE ALERT: since ReplaceVarsFromTargetList returns a mutated copy, we
|
|
* can't just apply it to sub_action; we have to remember to update the
|
|
* sublink inside rule_action, too.
|
|
*/
|
|
if ((event == CMD_INSERT || event == CMD_UPDATE) && sub_action->commandType != CMD_UTILITY) {
|
|
sub_action = (Query*)ReplaceVarsFromTargetList((Node*)sub_action,
|
|
new_varno,
|
|
0,
|
|
rt_fetch(new_varno, sub_action->rtable),
|
|
parsetree->targetList,
|
|
(event == CMD_UPDATE) ?
|
|
REPLACEVARS_CHANGE_VARNO :
|
|
REPLACEVARS_SUBSTITUTE_NULL,
|
|
current_varno,
|
|
NULL);
|
|
if (sub_action_ptr != NULL)
|
|
*sub_action_ptr = sub_action;
|
|
else
|
|
rule_action = sub_action;
|
|
}
|
|
|
|
/*
|
|
* If rule_action has a RETURNING clause, then either throw it away if the
|
|
* triggering query has no RETURNING clause, or rewrite it to emit what
|
|
* the triggering query's RETURNING clause asks for. Throw an error if
|
|
* more than one rule has a RETURNING clause.
|
|
*/
|
|
if (!parsetree->returningList)
|
|
rule_action->returningList = NIL;
|
|
else if (rule_action->returningList) {
|
|
if (*returning_flag)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("cannot have RETURNING lists in multiple rules")));
|
|
*returning_flag = true;
|
|
rule_action->returningList = (List*)ReplaceVarsFromTargetList((Node*)parsetree->returningList,
|
|
linitial_int(parsetree->resultRelations),
|
|
0,
|
|
rt_fetch(linitial_int(parsetree->resultRelations), parsetree->rtable),
|
|
rule_action->returningList,
|
|
REPLACEVARS_REPORT_ERROR,
|
|
0,
|
|
&rule_action->hasSubLinks);
|
|
|
|
/*
|
|
* There could have been some SubLinks in parsetree's returningList,
|
|
* in which case we'd better mark the rule_action correctly.
|
|
*/
|
|
if (parsetree->hasSubLinks && !rule_action->hasSubLinks)
|
|
rule_action->hasSubLinks = checkExprHasSubLink((Node*)rule_action->returningList);
|
|
}
|
|
return rule_action;
|
|
}
|
|
|
|
/*
|
|
* Copy the query's jointree list, and optionally attempt to remove any
|
|
* occurrence of the given rt_index as a top-level join item (we do not look
|
|
* for it within join items; this is OK because we are only expecting to find
|
|
* it as an UPDATE or DELETE target relation, which will be at the top level
|
|
* of the join). Returns modified jointree list --- this is a separate copy
|
|
* sharing no nodes with the original.
|
|
*/
|
|
static List* adjustJoinTreeList(Query* parsetree, bool removert, int rt_index)
|
|
{
|
|
List* newjointree = (List*)copyObject(parsetree->jointree->fromlist);
|
|
ListCell* l = NULL;
|
|
|
|
if (removert) {
|
|
foreach (l, newjointree) {
|
|
RangeTblRef* rtr = (RangeTblRef*)lfirst(l);
|
|
|
|
if (IsA(rtr, RangeTblRef) && rtr->rtindex == rt_index) {
|
|
newjointree = list_delete_ptr(newjointree, rtr);
|
|
|
|
/*
|
|
* foreach is safe because we exit loop after list_delete...
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return newjointree;
|
|
}
|
|
|
|
/*
|
|
* rewriteTargetListIU - rewrite INSERT/UPDATE targetlist into standard form
|
|
*
|
|
* This has the following responsibilities:
|
|
*
|
|
* 1. For an INSERT, add tlist entries to compute default values for any
|
|
* attributes that have defaults and are not assigned to in the given tlist.
|
|
* (We do not insert anything for default-less attributes, however. The
|
|
* planner will later insert NULLs for them, but there's no reason to slow
|
|
* down rewriter processing with extra tlist nodes.) Also, for both INSERT
|
|
* and UPDATE, replace explicit DEFAULT specifications with column default
|
|
* expressions.
|
|
*
|
|
* 2. For an UPDATE on a trigger-updatable view, add tlist entries for any
|
|
* unassigned-to attributes, assigning them their old values. These will
|
|
* later get expanded to the output values of the view. (This is equivalent
|
|
* to what the planner's expand_targetlist() will do for UPDATE on a regular
|
|
* table, but it's more convenient to do it here while we still have easy
|
|
* access to the view's original RT index.) This is only necessary for
|
|
* trigger-updatable views, for which the view remains the result relation of
|
|
* the query. For auto-updatable views we must not do this, since it might
|
|
* add assignments to non-updatable view columns. For rule-updatable views it
|
|
* is unnecessary extra work, since the query will be rewritten with a
|
|
* different result relation which will be processed when we recurse via
|
|
* RewriteQuery.
|
|
*
|
|
* 3. Merge multiple entries for the same target attribute, or declare error
|
|
* if we can't. Multiple entries are only allowed for INSERT/UPDATE of
|
|
* portions of an array or record field, for example
|
|
* UPDATE table SET foo[2] = 42, foo[4] = 43;
|
|
* We can merge such operations into a single assignment op. Essentially,
|
|
* the expression we want to produce in this case is like
|
|
* foo = array_set(array_set(foo, 2, 42), 4, 43)
|
|
*
|
|
* 4. Sort the tlist into standard order: non-junk fields in order by resno,
|
|
* then junk fields (these in no particular order).
|
|
*
|
|
* We must do items 1,2,3 before firing rewrite rules, else rewritten
|
|
* references to NEW.foo will produce wrong or incomplete results. Item 4
|
|
* is not needed for rewriting, but will be needed by the planner, and we
|
|
* can do it essentially for free while handling the other items.
|
|
*
|
|
* If attrno_list isn't NULL, we return an additional output besides the
|
|
* rewritten targetlist: an integer list of the assigned-to attnums, in
|
|
* order of the original tlist's non-junk entries. This is needed for
|
|
* processing VALUES RTEs.
|
|
*/
|
|
static List* rewriteTargetListIU(List* targetList, CmdType commandType, Relation target_relation,
|
|
int result_rtindex, List** attrno_list, bool* hasGenCol)
|
|
{
|
|
TargetEntry** new_tles;
|
|
List* new_tlist = NIL;
|
|
List* junk_tlist = NIL;
|
|
Form_pg_attribute att_tup;
|
|
int attrno, next_junk_attrno, numattrs;
|
|
ListCell* temp = NULL;
|
|
|
|
if (attrno_list != NULL) /* initialize optional result list */
|
|
*attrno_list = NIL;
|
|
|
|
/*
|
|
* We process the normal (non-junk) attributes by scanning the input tlist
|
|
* once and transferring TLEs into an array, then scanning the array to
|
|
* build an output tlist. This avoids O(N^2) behavior for large numbers
|
|
* of attributes.
|
|
*
|
|
* Junk attributes are tossed into a separate list during the same tlist
|
|
* scan, then appended to the reconstructed tlist.
|
|
*/
|
|
numattrs = RelationGetNumberOfAttributes(target_relation);
|
|
new_tles = (TargetEntry**)palloc0(numattrs * sizeof(TargetEntry*));
|
|
next_junk_attrno = numattrs + 1;
|
|
|
|
foreach (temp, targetList) {
|
|
TargetEntry* old_tle = (TargetEntry*)lfirst(temp);
|
|
|
|
if (!old_tle->resjunk) {
|
|
/* Normal attr: stash it into new_tles[] */
|
|
attrno = old_tle->resno;
|
|
if (attrno < 1 || attrno > numattrs) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("bogus resno %d in targetlist", attrno)));
|
|
}
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* put attrno into attrno_list even if it's dropped */
|
|
if (attrno_list != NULL && IsA(old_tle->expr, Var))
|
|
*attrno_list = lappend_int(*attrno_list, attrno);
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped)
|
|
continue;
|
|
|
|
/* Merge with any prior assignment to same attribute */
|
|
new_tles[attrno - 1] = process_matched_tle(old_tle, new_tles[attrno - 1], NameStr(att_tup->attname));
|
|
} else {
|
|
/*
|
|
* Copy all resjunk tlist entries to junk_tlist, and assign them
|
|
* resnos above the last real resno.
|
|
*
|
|
* Typical junk entries include ORDER BY or GROUP BY expressions
|
|
* (are these actually possible in an INSERT or UPDATE?), system
|
|
* attribute references, etc.
|
|
*
|
|
* Get the resno right, but don't copy unnecessarily
|
|
*/
|
|
if (old_tle->resno != next_junk_attrno) {
|
|
old_tle = flatCopyTargetEntry(old_tle);
|
|
old_tle->resno = next_junk_attrno;
|
|
}
|
|
junk_tlist = lappend(junk_tlist, old_tle);
|
|
next_junk_attrno++;
|
|
}
|
|
}
|
|
|
|
for (attrno = 1; attrno <= numattrs; attrno++) {
|
|
TargetEntry* new_tle = new_tles[attrno - 1];
|
|
bool applyDefault = false;
|
|
bool generateCol = ISGENERATEDCOL(target_relation->rd_att, attrno - 1);
|
|
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped)
|
|
continue;
|
|
|
|
/*
|
|
* Handle the two cases where we need to insert a default expression:
|
|
* it's an INSERT and there's no tlist entry for the column, or the
|
|
* tlist entry is a DEFAULT placeholder node.
|
|
*/
|
|
applyDefault = ((new_tle == NULL && commandType == CMD_INSERT) ||
|
|
(new_tle != NULL && new_tle->expr != NULL && IsA(new_tle->expr, SetToDefault)));
|
|
|
|
if (generateCol && !applyDefault) {
|
|
if (commandType == CMD_INSERT && attrno_list == NULL) {
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("cannot insert into column \"%s\"", NameStr(att_tup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(att_tup->attname))));
|
|
}
|
|
if (commandType == CMD_UPDATE && new_tle) {
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("column \"%s\" can only be updated to DEFAULT", NameStr(att_tup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(att_tup->attname))));
|
|
}
|
|
}
|
|
|
|
if (generateCol) {
|
|
/*
|
|
* stored generated column will be fixed in executor
|
|
*/
|
|
new_tle = NULL;
|
|
*hasGenCol = true;
|
|
} else if (applyDefault) {
|
|
Node* new_expr = NULL;
|
|
|
|
new_expr = build_column_default(target_relation, attrno, true);
|
|
|
|
/*
|
|
* If there is no default (ie, default is effectively NULL), we
|
|
* can omit the tlist entry in the INSERT case, since the planner
|
|
* can insert a NULL for itself, and there's no point in spending
|
|
* any more rewriter cycles on the entry. But in the UPDATE case
|
|
* we've got to explicitly set the column to NULL.
|
|
*/
|
|
if (new_expr == NULL) {
|
|
if (commandType == CMD_INSERT) {
|
|
new_tle = NULL;
|
|
ereport(DEBUG2, (errmodule(MOD_PARSER), errcode(ERRCODE_LOG),
|
|
errmsg("default column \"%s\" is effectively NULL, and hence omitted.",
|
|
NameStr(att_tup->attname))));
|
|
} else if (target_relation->rd_rel->relkind != RELKIND_VIEW) {
|
|
new_expr = (Node*)makeConst(att_tup->atttypid,
|
|
-1,
|
|
att_tup->attcollation,
|
|
att_tup->attlen,
|
|
(Datum)0,
|
|
true, /* isnull */
|
|
att_tup->attbyval);
|
|
/* this is to catch a NOT NULL domain constraint */
|
|
new_expr = coerce_to_domain(
|
|
new_expr, InvalidOid, -1, att_tup->atttypid, COERCE_IMPLICIT_CAST, -1, false, false);
|
|
}
|
|
}
|
|
|
|
if (new_expr != NULL)
|
|
new_tle = makeTargetEntry((Expr*)new_expr, attrno, pstrdup(NameStr(att_tup->attname)), false);
|
|
}
|
|
|
|
/*
|
|
* For an UPDATE on a view, provide a dummy entry whenever there is no
|
|
* explicit assignment.
|
|
*/
|
|
if (new_tle == NULL && commandType == CMD_UPDATE && ((target_relation->rd_rel->relkind == RELKIND_VIEW
|
|
&& view_has_instead_trigger(target_relation, CMD_UPDATE))
|
|
|| target_relation->rd_rel->relkind == RELKIND_CONTQUERY)) {
|
|
Node* new_expr = NULL;
|
|
|
|
new_expr = (Node*)makeVar(
|
|
result_rtindex, attrno, att_tup->atttypid, att_tup->atttypmod, att_tup->attcollation, 0);
|
|
new_tle = makeTargetEntry((Expr*)new_expr, attrno, pstrdup(NameStr(att_tup->attname)), false);
|
|
}
|
|
|
|
if (new_tle != NULL)
|
|
new_tlist = lappend(new_tlist, new_tle);
|
|
}
|
|
|
|
pfree_ext(new_tles);
|
|
|
|
targetList = list_concat(new_tlist, junk_tlist);
|
|
return targetList;
|
|
}
|
|
|
|
static void rewriteTargetListMutilUpdate(Query* parsetree, List* rtable, List* resultRelations)
|
|
{
|
|
TargetEntry** new_tles;
|
|
List* new_tlist = NIL;
|
|
List* junk_tlist = NIL;
|
|
Form_pg_attribute att_tup;
|
|
int attrno, numattrs;
|
|
ListCell* l = NULL;
|
|
int result_relation;
|
|
|
|
/*
|
|
* We process the normal (non-junk) attributes by scanning the input tlist
|
|
* once and transferring TLEs into an array, then scanning the array to
|
|
* build an output tlist. This avoids O(N^2) behavior for large numbers
|
|
* of attributes.
|
|
*
|
|
* Junk attributes are tossed into a separate list during the same tlist
|
|
* scan, then appended to the reconstructed tlist.
|
|
*/
|
|
ListCell* temp = list_head(parsetree->targetList);
|
|
TargetEntry* old_tle = (TargetEntry*)lfirst(temp);
|
|
|
|
foreach (l, resultRelations) {
|
|
result_relation = lfirst_int(l);
|
|
Assert(((TargetEntry*)lfirst(temp))->rtindex == (Index)result_relation);
|
|
|
|
RangeTblEntry* rt_entry = rt_fetch(result_relation, rtable);
|
|
Relation target_relation = heap_open(rt_entry->relid, NoLock);
|
|
numattrs = RelationGetNumberOfAttributes(target_relation);
|
|
|
|
new_tles = (TargetEntry**)palloc0(numattrs * sizeof(TargetEntry*));
|
|
|
|
while (temp != NULL) {
|
|
old_tle = (TargetEntry*)lfirst(temp);
|
|
/*
|
|
* For multi-relations update, old_tle has been sorted according to the order of each result relation.
|
|
* So when old_tle->rtindex != (Index)result_relation, break and process the next step.
|
|
*/
|
|
if (old_tle->rtindex != (Index)result_relation)
|
|
break;
|
|
|
|
if (!old_tle->resjunk) {
|
|
/* Normal attr: stash it into new_tles[] */
|
|
attrno = old_tle->resno;
|
|
if (attrno < 1 || attrno > numattrs) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("bogus resno %d in targetlist",
|
|
attrno)));
|
|
}
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped) {
|
|
temp = lnext(temp);
|
|
continue;
|
|
}
|
|
/* Merge with any prior assignment to same attribute */
|
|
new_tles[attrno - 1] = process_matched_tle(old_tle, new_tles[attrno - 1], NameStr(att_tup->attname));
|
|
} else {
|
|
/*
|
|
* Copy all resjunk tlist entries to junk_tlist, and assign them
|
|
* resnos above the last real resno.
|
|
*
|
|
* Typical junk entries include ORDER BY or GROUP BY expressions
|
|
* (are these actually possible in an INSERT or UPDATE?), system
|
|
* attribute references, etc.
|
|
*
|
|
* Get the resno right, but don't copy unnecessarily
|
|
*/
|
|
old_tle = flatCopyTargetEntry(old_tle);
|
|
junk_tlist = lappend(junk_tlist, old_tle);
|
|
}
|
|
temp = lnext(temp);
|
|
}
|
|
|
|
for (attrno = 1; attrno <= numattrs; attrno++) {
|
|
TargetEntry* new_tle = new_tles[attrno - 1];
|
|
/*
|
|
* We need to insert a default expression when the
|
|
* tlist entry is a DEFAULT placeholder node.
|
|
*/
|
|
bool applyDefault = new_tle != NULL && new_tle->expr != NULL && IsA(new_tle->expr, SetToDefault);
|
|
bool generateCol = ISGENERATEDCOL(target_relation->rd_att, attrno - 1);
|
|
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped)
|
|
continue;
|
|
|
|
if (generateCol && !applyDefault && new_tle) {
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("column \"%s\" can only be updated to DEFAULT", NameStr(att_tup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(att_tup->attname))));
|
|
}
|
|
|
|
if (generateCol) {
|
|
/*
|
|
* stored generated column will be fixed in executor
|
|
*/
|
|
new_tle = NULL;
|
|
} else if (applyDefault) {
|
|
Node* new_expr = build_column_default(target_relation, attrno, true);
|
|
if (new_expr == NULL && target_relation->rd_rel->relkind != RELKIND_VIEW) {
|
|
new_expr = (Node*)makeConst(att_tup->atttypid,
|
|
-1,
|
|
att_tup->attcollation,
|
|
att_tup->attlen,
|
|
(Datum)0,
|
|
true, /* isnull */
|
|
att_tup->attbyval);
|
|
/* this is to catch a NOT NULL domain constraint */
|
|
new_expr = coerce_to_domain(
|
|
new_expr, InvalidOid, -1, att_tup->atttypid, COERCE_IMPLICIT_CAST, -1, false, false);
|
|
}
|
|
if (new_expr != NULL) {
|
|
new_tle = makeTargetEntry((Expr*)new_expr, attrno, pstrdup(NameStr(att_tup->attname)), false);
|
|
}
|
|
new_tle->rtindex = result_relation;
|
|
}
|
|
|
|
/*
|
|
* For an UPDATE on a view, provide a dummy entry whenever there is no
|
|
* explicit assignment.
|
|
*/
|
|
if (new_tle == NULL && ((target_relation->rd_rel->relkind == RELKIND_VIEW
|
|
&& view_has_instead_trigger(target_relation, CMD_UPDATE))
|
|
|| target_relation->rd_rel->relkind == RELKIND_CONTQUERY)) {
|
|
Node* new_expr = NULL;
|
|
|
|
new_expr = (Node*)makeVar(
|
|
result_relation, attrno, att_tup->atttypid, att_tup->atttypmod, att_tup->attcollation, 0);
|
|
new_tle = makeTargetEntry((Expr*)new_expr, attrno, pstrdup(NameStr(att_tup->attname)), false);
|
|
new_tle->rtindex = result_relation;
|
|
}
|
|
|
|
if (new_tle != NULL)
|
|
new_tlist = lappend(new_tlist, new_tle);
|
|
}
|
|
|
|
heap_close(target_relation, NoLock);
|
|
pfree_ext(new_tles);
|
|
}
|
|
|
|
int next_junk_attrno = list_length(new_tlist) + 1;
|
|
|
|
foreach (l, junk_tlist) {
|
|
old_tle = (TargetEntry*)lfirst(l);
|
|
if (old_tle->resno != next_junk_attrno) {
|
|
old_tle = flatCopyTargetEntry(old_tle);
|
|
old_tle->resno = next_junk_attrno;
|
|
}
|
|
new_tlist = lappend(new_tlist, old_tle);
|
|
next_junk_attrno++;
|
|
}
|
|
|
|
parsetree->targetList = new_tlist;
|
|
|
|
rewriteTargetListMutilUD(parsetree, rtable, resultRelations);
|
|
}
|
|
|
|
static void multiUpdateSetExtraUpdatedCols(Query* parsetree)
|
|
{
|
|
ListCell* lc = NULL;
|
|
RangeTblEntry* rte = NULL;
|
|
Relation rel;
|
|
|
|
foreach (lc, parsetree->resultRelations) {
|
|
rte = rt_fetch(lfirst_int(lc), parsetree->rtable);
|
|
rel = heap_open(rte->relid, NoLock);
|
|
setExtraUpdatedCols(rte, rel->rd_att);
|
|
heap_close(rel, NoLock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a matched TLE from the original tlist into a correct new TLE.
|
|
*
|
|
* This routine detects and handles multiple assignments to the same target
|
|
* attribute. (The attribute name is needed only for error messages.)
|
|
*/
|
|
static TargetEntry* process_matched_tle(TargetEntry* src_tle, TargetEntry* prior_tle, const char* attrName)
|
|
{
|
|
TargetEntry* result = NULL;
|
|
Node* src_expr = NULL;
|
|
Node* prior_expr = NULL;
|
|
Node* src_input = NULL;
|
|
Node* prior_input = NULL;
|
|
Node* priorbottom = NULL;
|
|
Node* newexpr = NULL;
|
|
errno_t errorno = EOK;
|
|
|
|
if (prior_tle == NULL) {
|
|
/*
|
|
* Normal case where this is the first assignment to the attribute.
|
|
*/
|
|
return src_tle;
|
|
}
|
|
|
|
/* ----------
|
|
* Multiple assignments to same attribute. Allow only if all are
|
|
* FieldStore or ArrayRef assignment operations. This is a bit
|
|
* tricky because what we may actually be looking at is a nest of
|
|
* such nodes; consider
|
|
* UPDATE tab SET col.fld1.subfld1 = x, col.fld2.subfld2 = y
|
|
* The two expressions produced by the parser will look like
|
|
* FieldStore(col, fld1, FieldStore(placeholder, subfld1, x))
|
|
* FieldStore(col, fld2, FieldStore(placeholder, subfld2, x))
|
|
* However, we can ignore the substructure and just consider the top
|
|
* FieldStore or ArrayRef from each assignment, because it works to
|
|
* combine these as
|
|
* FieldStore(FieldStore(col, fld1,
|
|
* FieldStore(placeholder, subfld1, x)),
|
|
* fld2, FieldStore(placeholder, subfld2, x))
|
|
* Note the leftmost expression goes on the inside so that the
|
|
* assignments appear to occur left-to-right.
|
|
*
|
|
* For FieldStore, instead of nesting we can generate a single
|
|
* FieldStore with multiple target fields. We must nest when
|
|
* ArrayRefs are involved though.
|
|
* ----------
|
|
*/
|
|
src_expr = (Node*)src_tle->expr;
|
|
prior_expr = (Node*)prior_tle->expr;
|
|
src_input = get_assignment_input(src_expr);
|
|
prior_input = get_assignment_input(prior_expr);
|
|
if (src_input == NULL || prior_input == NULL || exprType(src_expr) != exprType(prior_expr)) {
|
|
ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("multiple assignments to same column \"%s\"", attrName)));
|
|
}
|
|
/*
|
|
* Prior TLE could be a nest of assignments if we do this more than once.
|
|
*/
|
|
priorbottom = prior_input;
|
|
for (;;) {
|
|
Node* newbottom = get_assignment_input(priorbottom);
|
|
|
|
if (newbottom == NULL) {
|
|
break; /* found the original Var reference */
|
|
}
|
|
priorbottom = newbottom;
|
|
}
|
|
if (!equal(priorbottom, src_input)) {
|
|
ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("multiple assignments to same column \"%s\"", attrName)));
|
|
}
|
|
/*
|
|
* Looks OK to nest 'em.
|
|
*/
|
|
size_t fstore_len = sizeof(FieldStore);
|
|
if (IsA(src_expr, FieldStore)) {
|
|
FieldStore* fstore = makeNode(FieldStore);
|
|
|
|
if (IsA(prior_expr, FieldStore)) {
|
|
/* combine the two */
|
|
errorno = memcpy_s(fstore, fstore_len, prior_expr, fstore_len);
|
|
securec_check(errorno, "\0", "\0");
|
|
fstore->newvals =
|
|
list_concat(list_copy(((FieldStore*)prior_expr)->newvals), list_copy(((FieldStore*)src_expr)->newvals));
|
|
fstore->fieldnums = list_concat(
|
|
list_copy(((FieldStore*)prior_expr)->fieldnums), list_copy(((FieldStore*)src_expr)->fieldnums));
|
|
} else {
|
|
/* general case, just nest 'em */
|
|
errorno = memcpy_s(fstore, fstore_len, src_expr, fstore_len);
|
|
securec_check(errorno, "\0", "\0");
|
|
fstore->arg = (Expr*)prior_expr;
|
|
}
|
|
newexpr = (Node*)fstore;
|
|
} else if (IsA(src_expr, ArrayRef)) {
|
|
ArrayRef* aref = makeNode(ArrayRef);
|
|
|
|
errorno = memcpy_s(aref, sizeof(ArrayRef), src_expr, sizeof(ArrayRef));
|
|
securec_check(errorno, "\0", "\0");
|
|
aref->refexpr = (Expr*)prior_expr;
|
|
newexpr = (Node*)aref;
|
|
} else {
|
|
ereport(ERROR, (errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("cannot happen")));
|
|
|
|
newexpr = NULL;
|
|
}
|
|
|
|
result = flatCopyTargetEntry(src_tle);
|
|
result->expr = (Expr*)newexpr;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* If node is an assignment node, return its input; else return NULL
|
|
*/
|
|
static Node* get_assignment_input(Node* node)
|
|
{
|
|
if (node == NULL)
|
|
return NULL;
|
|
if (IsA(node, FieldStore)) {
|
|
FieldStore* fstore = (FieldStore*)node;
|
|
|
|
return (Node*)fstore->arg;
|
|
} else if (IsA(node, ArrayRef)) {
|
|
ArrayRef* aref = (ArrayRef*)node;
|
|
|
|
if (aref->refassgnexpr == NULL)
|
|
return NULL;
|
|
return (Node*)aref->refexpr;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static bool check_sequence_return_numeric_walker(Node *node, int *ret)
|
|
{
|
|
/* Traverse through the expression tree and check requence related function return type */
|
|
if (node == NULL) {
|
|
*ret = NDE_UNKNOWN;
|
|
return false;
|
|
}
|
|
|
|
if (IsA(node, Query)) {
|
|
return (Node *)query_tree_walker((Query *)node, (bool (*)())check_sequence_return_numeric_walker,
|
|
(void *)ret, 0);
|
|
}
|
|
|
|
if (IsA(node, FuncExpr)) {
|
|
FuncExpr *func = (FuncExpr *)node;
|
|
if (func->funcid == NEXTVALFUNCOID || func->funcid == CURRVALFUNCOID || func->funcid == LASTVALFUNCOID) {
|
|
if (func->funcresulttype == NUMERICOID) {
|
|
*ret = NDE_NUMERIC;
|
|
return true;
|
|
} else {
|
|
*ret = NDE_BIGINT;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return expression_tree_walker(node, (bool (*)())check_sequence_return_numeric_walker, (void *)ret);
|
|
}
|
|
|
|
/*
|
|
* Make an expression tree for the default value for a column.
|
|
*
|
|
* If there is no default, return a NULL instead.
|
|
* Add one input arg isInsertCmd to show if current statement is insert.
|
|
* If auto truncation function enabled and it is insert statement then
|
|
* we use this arg to determin if default should be casted explict.
|
|
*/
|
|
Node* build_column_default(Relation rel, int attrno, bool isInsertCmd, bool needOnUpdate)
|
|
{
|
|
TupleDesc rd_att = rel->rd_att;
|
|
Form_pg_attribute att_tup = &rd_att->attrs[attrno - 1];
|
|
Oid atttype = att_tup->atttypid;
|
|
int32 atttypmod = att_tup->atttypmod;
|
|
Node* expr = NULL;
|
|
Oid exprtype;
|
|
|
|
/*
|
|
* Scan to see if relation has a default for this column.
|
|
*/
|
|
if (rd_att->constr && rd_att->constr->num_defval > 0) {
|
|
AttrDefault* defval = rd_att->constr->defval;
|
|
int ndef = rd_att->constr->num_defval;
|
|
|
|
while (--ndef >= 0) {
|
|
if (attrno == defval[ndef].adnum) {
|
|
/*
|
|
* Found it, convert string representation to node tree.
|
|
*
|
|
* isInsertCmd is false, has_on_update is true and adbin_on_update is not null character string,
|
|
* then doing convert adbin_on_update to expression.
|
|
* if adbin is not null character string, then doing convert adbin to expression.
|
|
*/
|
|
|
|
if (needOnUpdate && (!isInsertCmd) && defval[ndef].adbin_on_update != nullptr &&
|
|
pg_strcasecmp(defval[ndef].adbin_on_update, "") != 0) {
|
|
expr = (Node*)stringToNode_skip_extern_fields(defval[ndef].adbin_on_update);
|
|
} else if (defval[ndef].adbin != nullptr && pg_strcasecmp(defval[ndef].adbin, "") != 0) {
|
|
expr = (Node*)stringToNode_skip_extern_fields(defval[ndef].adbin);
|
|
}
|
|
if (t_thrd.proc->workingVersionNum < LARGE_SEQUENCE_VERSION_NUM) {
|
|
(void)check_sequence_return_numeric_walker(expr, &(u_sess->opt_cxt.nextval_default_expr_type));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (expr == NULL && !ISGENERATEDCOL(rd_att, attrno - 1)) {
|
|
/*
|
|
* No per-column default, so look for a default for the type itself.But
|
|
* not for generated columns.
|
|
*/
|
|
expr = get_typdefault(atttype);
|
|
}
|
|
|
|
if (expr == NULL)
|
|
return NULL; /* No default anywhere */
|
|
|
|
if (IsA(expr, AutoIncrement)) {
|
|
expr = (Node*)makeConst(INT4OID, -1, InvalidOid, sizeof(int32), Int32GetDatum(0), !att_tup->attnotnull, true);
|
|
}
|
|
|
|
/*
|
|
* Make sure the value is coerced to the target column type; this will
|
|
* generally be true already, but there seem to be some corner cases
|
|
* involving domain defaults where it might not be true. This should match
|
|
* the parser's processing of non-defaulted expressions --- see
|
|
* transformAssignedExpr().
|
|
*/
|
|
exprtype = exprType(expr);
|
|
|
|
expr = coerce_to_target_type(NULL, /* no UNKNOWN params here */
|
|
expr,
|
|
exprtype,
|
|
atttype,
|
|
atttypmod,
|
|
COERCION_ASSIGNMENT,
|
|
COERCE_IMPLICIT_CAST,
|
|
-1);
|
|
|
|
/*
|
|
* When td_compatible_truncation is set to on, this part of code will set column default
|
|
* value to isExplicte args to true, to let bpchar know one explict cast has been added to
|
|
* this default value already.
|
|
*/
|
|
if (u_sess->attr.attr_sql.td_compatible_truncation && u_sess->attr.attr_sql.sql_compatibility == C_FORMAT &&
|
|
isInsertCmd && (atttype == BPCHAROID || atttype == VARCHAROID) && expr != NULL) {
|
|
AssertEreport(IsA(expr, FuncExpr), MOD_OPT, "");
|
|
|
|
FuncExpr* fe = (FuncExpr*)expr;
|
|
Const* const_arg = (Const*)llast(fe->args);
|
|
if (IsA(const_arg, Const) && const_arg->consttype == BOOLOID)
|
|
const_arg->constvalue = (Datum) true;
|
|
}
|
|
|
|
if (expr == NULL)
|
|
ereport(ERROR, (errcode(ERRCODE_DATATYPE_MISMATCH),
|
|
errmsg("column \"%s\" is of type %s but %s expression is of type %s", NameStr(att_tup->attname),
|
|
format_type_be(atttype), ISGENERATEDCOL(rd_att, attrno - 1) ? "generated column" : "deault",
|
|
format_type_be(exprtype)), errhint("You will need to rewrite or cast the expression.")));
|
|
/*
|
|
* If there is nextval FuncExpr, we should lock the quoted sequence to avoid deadlock,
|
|
* this has beed done in transformFuncExpr. See lockNextvalOnCn for more details.
|
|
*/
|
|
(void)lockNextvalWalker(expr, NULL);
|
|
return expr;
|
|
}
|
|
|
|
/* Does VALUES RTE contain any SetToDefault items? */
|
|
static bool searchForDefault(RangeTblEntry* rte)
|
|
{
|
|
ListCell* lc = NULL;
|
|
|
|
foreach (lc, rte->values_lists) {
|
|
List* sublist = (List*)lfirst(lc);
|
|
ListCell* lc2 = NULL;
|
|
|
|
foreach (lc2, sublist) {
|
|
Node* col = (Node*)lfirst(lc2);
|
|
|
|
if (IsA(col, SetToDefault))
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void checkGenDefault(RangeTblEntry* rte, Relation target_relation, List* attrnos, bool hasGenCol)
|
|
{
|
|
ListCell* lc = NULL;
|
|
|
|
if (!hasGenCol) {
|
|
return ;
|
|
}
|
|
|
|
foreach (lc, rte->values_lists) {
|
|
List* sublist = (List*)lfirst(lc);
|
|
ListCell* lc2 = NULL;
|
|
ListCell* lc3 = NULL;
|
|
|
|
forboth (lc2, sublist, lc3, attrnos) {
|
|
Node* col = (Node*)lfirst(lc2);
|
|
int attrno = lfirst_int(lc3);
|
|
Form_pg_attribute att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
bool generatedCol = ISGENERATEDCOL(target_relation->rd_att, attrno - 1);
|
|
bool applyDefault = IsA(col, SetToDefault);
|
|
|
|
if (!applyDefault && generatedCol)
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("cannot insert into column \"%s\"", NameStr(att_tup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(att_tup->attname))));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When processing INSERT ... VALUES with a VALUES RTE (ie, multiple VALUES
|
|
* lists), we have to replace any DEFAULT items in the VALUES lists with
|
|
* the appropriate default expressions. The other aspects of targetlist
|
|
* rewriting need be applied only to the query's targetlist proper.
|
|
*
|
|
* For an auto-updatable view, each DEFAULT item in the VALUES list is
|
|
* replaced with the default from the view, if it has one. Otherwise it is
|
|
* left untouched so that the underlying base relation's default can be
|
|
* applied instead (when we later recurse to here after rewriting the query
|
|
* to refer to the base relation instead of the view).
|
|
*
|
|
* For other types of relation, including rule- and trigger-updatable views,
|
|
* all DEFAULT items are replaced, and if the target relation doesn't have a
|
|
* default, the value is explicitly set to NULL.
|
|
*
|
|
* Additionally, if force_nulls is true, the target relation's defaults are
|
|
* ignored and all DEFAULT items in the VALUES list are explicitly set to
|
|
* NULL, regardless of the target relation's type. This is used for the
|
|
* product queries generated by DO ALSO rules attached to an auto-updatable
|
|
* view, for which we will have already called this function with force_nulls
|
|
* false. For these product queries, we must then force any remaining DEFAULT
|
|
* items to NULL to provide concrete values for the rule actions.
|
|
* Essentially, this is a mix of the 2 cases above --- the original query is
|
|
* an insert into an auto-updatable view, and the product queries are inserts
|
|
* into a rule-updatable view.
|
|
*
|
|
* Note that we may have subscripted or field assignment targetlist entries,
|
|
* as well as more complex expressions from already-replaced DEFAULT items if
|
|
* we have recursed to here for an auto-updatable view. However, it ought to
|
|
* be impossible for such entries to have DEFAULTs assigned to them --- we
|
|
* should only have to replace DEFAULT items for targetlist entries that
|
|
* contain simple Vars referencing the VALUES RTE.
|
|
*
|
|
* Returns true if all DEFAULT items were replaced, and false if some were
|
|
* left untouched.
|
|
*/
|
|
static bool rewriteValuesRTE(Query* parsetree, RangeTblEntry* rte, Relation target_relation, List* attrnos,
|
|
bool force_nulls)
|
|
{
|
|
List* newValues = NIL;
|
|
ListCell* lc = NULL;
|
|
bool isAutoUpdatableView;
|
|
bool allReplaced;
|
|
|
|
/* Steps below are not sensible for non-INSERT queries */
|
|
Assert(parsetree->commandType == CMD_INSERT);
|
|
Assert(rte->rtekind == RTE_VALUES);
|
|
|
|
/*
|
|
* Rebuilding all the lists is a pretty expensive proposition in a big
|
|
* VALUES list, and it's a waste of time if there aren't any DEFAULT
|
|
* placeholders. So first scan to see if there are any.
|
|
* We skip this check if force_nulls is true, because we know that there
|
|
* are DEFAULT items present in that case.
|
|
*/
|
|
if (!force_nulls && !searchForDefault(rte))
|
|
return true; /* nothing to do */
|
|
|
|
/*
|
|
* Check if the target relation is an auto-updatable view, in which case
|
|
* unresolved defaults will be left untouched rather than being set to
|
|
* NULL. If force_nulls is true, we always set DEFAULT items to NULL, so
|
|
* skip this check in that case --- it isn't an auto-updatable view.
|
|
*/
|
|
isAutoUpdatableView = false;
|
|
if (!force_nulls && target_relation->rd_rel->relkind == RELKIND_VIEW &&
|
|
!view_has_instead_trigger(target_relation, CMD_INSERT)) {
|
|
List* locks = NIL;
|
|
bool found;
|
|
ListCell* l = NULL;
|
|
|
|
/* Look for an unconditional DO INSTEAD rule */
|
|
locks = matchLocks(CMD_INSERT, target_relation->rd_rules, linitial_int(parsetree->resultRelations), parsetree);
|
|
|
|
found = false;
|
|
foreach (l, locks) {
|
|
RewriteRule* rule_lock = (RewriteRule*)lfirst(l);
|
|
|
|
if (rule_lock->isInstead && rule_lock->qual == NULL) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we didn't find an unconditional DO INSTEAD rule, assume that the
|
|
* view is auto-updatable. If it isn't, rewriteTargetView() will
|
|
* throw an error.
|
|
*/
|
|
if (!found)
|
|
isAutoUpdatableView = true;
|
|
}
|
|
|
|
newValues = NIL;
|
|
allReplaced = true;
|
|
foreach (lc, rte->values_lists) {
|
|
List* sublist = (List*)lfirst(lc);
|
|
List* newList = NIL;
|
|
ListCell* lc2 = NULL;
|
|
ListCell* lc3 = NULL;
|
|
int i = 0;
|
|
|
|
forboth(lc2, sublist, lc3, attrnos)
|
|
{
|
|
Node *col = (Node *)lfirst(lc2);
|
|
int attrno = lfirst_int(lc3);
|
|
Form_pg_attribute att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
bool generatedCol = ISGENERATEDCOL(target_relation->rd_att, attrno - 1);
|
|
bool applyDefault = IsA(col, SetToDefault);
|
|
|
|
if (applyDefault) {
|
|
Node *new_expr = NULL;
|
|
|
|
if (attrno == 0) {
|
|
ereport(ERROR, (errmsg("cannot set value in column %d to DEFAULT", ++i)));
|
|
}
|
|
|
|
/* stored generated column will be computed in executor */
|
|
if (force_nulls || att_tup->attisdropped || generatedCol)
|
|
new_expr = NULL;
|
|
else
|
|
new_expr = build_column_default(target_relation, attrno, true);
|
|
|
|
/*
|
|
* If there is no default (ie, default is effectively NULL),
|
|
* we've got to explicitly set the column to NULL, unless the
|
|
* target relation is an auto-updatable view.
|
|
*/
|
|
if (new_expr == NULL) {
|
|
if (isAutoUpdatableView) {
|
|
/* Leave the value untouched */
|
|
newList = lappend(newList, col);
|
|
allReplaced = false;
|
|
continue;
|
|
}
|
|
|
|
new_expr = (Node*)makeConst(att_tup->atttypid,
|
|
-1,
|
|
att_tup->attcollation,
|
|
att_tup->attlen,
|
|
(Datum)0,
|
|
true, /* isnull */
|
|
att_tup->attbyval);
|
|
/* this is to catch a NOT NULL domain constraint */
|
|
new_expr = coerce_to_domain(
|
|
new_expr, InvalidOid, -1, att_tup->atttypid, COERCE_IMPLICIT_CAST, -1, false, false);
|
|
}
|
|
newList = lappend(newList, new_expr);
|
|
} else {
|
|
newList = lappend(newList, col);
|
|
}
|
|
}
|
|
newValues = lappend(newValues, newList);
|
|
}
|
|
rte->values_lists = newValues;
|
|
|
|
return allReplaced;
|
|
}
|
|
|
|
#ifdef PGXC
|
|
/*
|
|
* pull_qual_vars(Node *node, int varno)
|
|
* Extract vars from quals belonging to resultRelation. This function is mainly
|
|
* taken from pull_qual_vars_clause(), but since the later does not peek into
|
|
* subquery, we need to write this walker.
|
|
*
|
|
* @param (in) varno:
|
|
* the varno of result relation
|
|
* pull_qual_vars will returen all vars in current level if do NOT set 'varno' param
|
|
*
|
|
* @return:
|
|
* (1) vars from quals belonging to resultRelation
|
|
* (2) all vars from quals if 'varno' is not set
|
|
*/
|
|
List* pull_qual_vars(Node* node, int varno, int flags, bool nonRepeat)
|
|
|
|
{
|
|
pull_qual_vars_context context;
|
|
context.varlist = NIL;
|
|
context.sublevels_up = 0;
|
|
context.resultRelation = varno;
|
|
context.noRepeat = nonRepeat;
|
|
|
|
(void)query_or_expression_tree_walker(node, (bool (*)())pull_qual_vars_walker, (void*)&context, flags);
|
|
return context.varlist;
|
|
}
|
|
|
|
static bool pull_qual_vars_walker(Node* node, pull_qual_vars_context* context)
|
|
{
|
|
if (node == NULL)
|
|
return false;
|
|
if (IsA(node, Var)) {
|
|
Var* var = (Var*)node;
|
|
|
|
/*
|
|
* Add only if this var belongs to the resultRelation and refers to the table
|
|
* from the same query.
|
|
* BUT==> if context->resultRelation is not set,
|
|
* all var(s) refers to the table from the same query will be included
|
|
*/
|
|
if ((context->resultRelation == 0 || var->varno == (Index)context->resultRelation) &&
|
|
var->varlevelsup == (Index)context->sublevels_up) {
|
|
if (context->noRepeat && list_member(context->varlist, var))
|
|
return false;
|
|
|
|
Var* newvar = (Var*)copyObject(var);
|
|
newvar->varlevelsup = 0;
|
|
context->varlist = lappend(context->varlist, newvar);
|
|
}
|
|
return false;
|
|
}
|
|
if (IsA(node, Query)) {
|
|
/* Recurse into RTE subquery or not-yet-planned sublink subquery */
|
|
bool result = false;
|
|
|
|
context->sublevels_up++;
|
|
result = query_tree_walker((Query*)node, (bool (*)())pull_qual_vars_walker, (void*)context, 0);
|
|
context->sublevels_up--;
|
|
return result;
|
|
}
|
|
return expression_tree_walker(node, (bool (*)())pull_qual_vars_walker, (void*)context);
|
|
}
|
|
|
|
#endif /* PGXC */
|
|
|
|
/*
|
|
* rewriteTargetListUD - rewrite UPDATE/DELETE targetlist as needed
|
|
*
|
|
* This function adds a "junk" TLE that is needed to allow the executor to
|
|
* find the original row for the update or delete. When the target relation
|
|
* is a regular table, the junk TLE emits the ctid attribute of the original
|
|
* row. When the target relation is a view, there is no ctid, so we instead
|
|
* emit a whole-row Var that will contain the "old" values of the view row.
|
|
* If it's a foreign table, we let the FDW decide what to add.
|
|
*
|
|
* For UPDATE queries, this is applied after rewriteTargetListIU. The
|
|
* ordering isn't actually critical at the moment.
|
|
*/
|
|
static void rewriteTargetListUD(Query* parsetree, RangeTblEntry* target_rte, Relation target_relation, int rtindex)
|
|
{
|
|
Var* var = NULL;
|
|
const char* attrname = NULL;
|
|
TargetEntry* tle = NULL;
|
|
|
|
#ifdef PGXC
|
|
List* var_list = NIL;
|
|
ListCell* elt = NULL;
|
|
|
|
/*
|
|
* In openGauss, we need to evaluate quals of the parse tree and determine
|
|
* if they are Coordinator quals. If they are, their attribute need to be
|
|
* added to target list for evaluation. In case some are found, add them as
|
|
* junks in the target list. The junk status will be used by remote UPDATE
|
|
* planning to associate correct element to a clause.
|
|
* For DELETE, having such columns in target list helps to evaluate Quals
|
|
* correctly on Coordinator.
|
|
* This list could be reduced to keep only in target list the
|
|
* vars using Coordinator Quals.
|
|
*/
|
|
if (IS_PGXC_COORDINATOR && parsetree->jointree)
|
|
var_list = pull_qual_vars((Node*)parsetree->jointree, rtindex);
|
|
|
|
foreach (elt, var_list) {
|
|
Form_pg_attribute att_tup;
|
|
int numattrs = RelationGetNumberOfAttributes(target_relation);
|
|
|
|
var = (Var*)lfirst(elt);
|
|
/* Bypass in case of extra target items like ctid */
|
|
if (var->varattno < 1 || var->varattno > numattrs) {
|
|
if (var->varattno < 1) {
|
|
RangeTblEntry* rte = rt_fetch(var->varno, parsetree->rtable);
|
|
if (LOCATOR_TYPE_REPLICATED == GetLocatorType(rte->relid)) {
|
|
t_thrd.postmaster_cxt.forceNoSeparate = true;
|
|
}
|
|
|
|
parsetree->equalVars = lappend(parsetree->equalVars, copyObject(var));
|
|
}
|
|
continue;
|
|
}
|
|
|
|
att_tup = &target_relation->rd_att->attrs[var->varattno - 1];
|
|
tle = makeTargetEntry(
|
|
(Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(NameStr(att_tup->attname)), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
parsetree->equalVars = list_concat(
|
|
parsetree->equalVars, pull_qual_vars((Node*)parsetree->targetList, rtindex, 0, true));
|
|
|
|
if (IS_PGXC_COORDINATOR && RelationGetLocInfo(target_relation) &&
|
|
IsRelationReplicated(RelationGetLocInfo(target_relation)) && RelationIsRelation(target_relation)) {
|
|
int16* indexed_col = NULL;
|
|
int index_col_count = 0;
|
|
int counter = 0;
|
|
|
|
index_col_count = pgxc_find_primarykey(target_relation->rd_id, &indexed_col);
|
|
|
|
AssertEreport(index_col_count >= 0, MOD_OPT, "");
|
|
|
|
for (counter = 0; counter < index_col_count; counter++) {
|
|
AttrNumber att_no = indexed_col[counter];
|
|
HeapTuple heaptuple = NULL;
|
|
Form_pg_attribute att_tup = NULL;
|
|
Node* new_expr = NULL;
|
|
TargetEntry* new_tle = NULL;
|
|
|
|
if (att_no > 0) {
|
|
att_tup = &target_relation->rd_att->attrs[att_no - 1];
|
|
} else {
|
|
heaptuple =
|
|
SearchSysCache2(ATTNUM, ObjectIdGetDatum(RelationGetRelid(target_relation)), Int16GetDatum(att_no));
|
|
if (!HeapTupleIsValid(heaptuple))
|
|
ereport(ERROR, (errcode(ERRCODE_CACHE_LOOKUP_FAILED),
|
|
errmsg("cache lookup failed for attribute %d of relation %u", att_no,
|
|
RelationGetRelid(target_relation))));
|
|
att_tup = (Form_pg_attribute)GETSTRUCT(heaptuple);
|
|
}
|
|
|
|
new_expr = (Node*)makeVar(
|
|
rtindex, att_no, att_tup->atttypid, att_tup->atttypmod, att_tup->attcollation, 0);
|
|
new_tle = makeTargetEntry((Expr*)new_expr, list_length(parsetree->targetList) + 1, "xc_primary_key", true);
|
|
new_tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, new_tle);
|
|
|
|
if (att_no <= 0) {
|
|
ReleaseSysCache(heaptuple);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (target_relation->rd_rel->relkind == RELKIND_RELATION || target_relation->rd_rel->relkind == RELKIND_MATVIEW) {
|
|
/*
|
|
* Emit CTID so that executor can find the row to update or delete.
|
|
*/
|
|
var = makeVar(rtindex, SelfItemPointerAttributeNumber, TIDOID, -1, InvalidOid, 0);
|
|
|
|
attrname = "ctid";
|
|
} else if (target_relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE
|
|
|| target_relation->rd_rel->relkind == RELKIND_STREAM) {
|
|
/*
|
|
* Let the foreign table's FDW add whatever junk TLEs it wants.
|
|
*/
|
|
FdwRoutine* fdwroutine = NULL;
|
|
|
|
fdwroutine = GetFdwRoutineForRelation(target_relation, false);
|
|
|
|
if (fdwroutine->AddForeignUpdateTargets != NULL)
|
|
fdwroutine->AddForeignUpdateTargets(parsetree, target_rte, target_relation);
|
|
|
|
return;
|
|
} else {
|
|
/*
|
|
* Emit whole-row Var so that executor will have the "old" view row to
|
|
* pass to the INSTEAD OF trigger.
|
|
*/
|
|
var = makeWholeRowVar(target_rte, rtindex, 0, false);
|
|
if (var == NULL) {
|
|
ereport(ERROR,(errcode(ERRCODE_UNDEFINED_FILE),
|
|
errmsg("Fail to get the previous view row.")));
|
|
return;
|
|
}
|
|
attrname = "wholerow";
|
|
}
|
|
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
|
|
/* if a partitioned table , need get tableOid column */
|
|
if (target_relation->rd_rel->relkind == RELKIND_RELATION &&
|
|
(RELATION_IS_PARTITIONED(target_relation) || RelationIsCUFormat(target_relation))) {
|
|
|
|
var = makeVar(rtindex, TableOidAttributeNumber, OIDOID, -1, InvalidOid, 0);
|
|
attrname = "tableoid";
|
|
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
|
|
if (target_relation->rd_rel->relkind == RELKIND_RELATION && RELATION_HAS_BUCKET(target_relation)) {
|
|
var = makeVar(rtindex, BucketIdAttributeNumber, INT2OID, -1, InvalidBktId, 0);
|
|
attrname = "tablebucketid";
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
#ifdef PGXC
|
|
/* Add further attributes required for Coordinator */
|
|
if (IS_PGXC_COORDINATOR && RelationGetLocInfo(target_relation) != NULL &&
|
|
target_relation->rd_rel->relkind == RELKIND_RELATION) {
|
|
/*
|
|
* If relation is non-replicated, we need also to identify the Datanode
|
|
* from where tuple is fetched.
|
|
*/
|
|
if (!IsRelationReplicated(RelationGetLocInfo(target_relation))) {
|
|
var = makeVar(rtindex, XC_NodeIdAttributeNumber, INT4OID, -1, InvalidOid, 0);
|
|
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup("xc_node_id"), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
|
|
/* For non-shippable triggers, we need OLD row. */
|
|
if (pgxc_trig_oldrow_reqd(target_relation, parsetree->commandType)) {
|
|
var = makeWholeRowVar(target_rte, rtindex, 0, false);
|
|
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup("wholerow"), true);
|
|
tle->rtindex = rtindex;
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void rewriteTargetListMutilUD(Query* parsetree, List* rtable, List* resultRelations)
|
|
{
|
|
ListCell* lc;
|
|
int result_relation;
|
|
RangeTblEntry* rt_entry = NULL;
|
|
Relation rt_entry_relation;
|
|
|
|
foreach (lc, resultRelations) {
|
|
result_relation = lfirst_int(lc);
|
|
rt_entry = rt_fetch(result_relation, rtable);
|
|
AssertEreport(rt_entry->rtekind == RTE_RELATION, MOD_OPT, "");
|
|
rt_entry_relation = heap_open(rt_entry->relid, NoLock);
|
|
rewriteTargetListUD(parsetree, rt_entry, rt_entry_relation, result_relation);
|
|
heap_close(rt_entry_relation, NoLock);
|
|
}
|
|
}
|
|
|
|
void rewriteTargetListMerge(Query* parsetree, Index result_relation, List* range_table)
|
|
{
|
|
Var* var = NULL;
|
|
const char* attrname = NULL;
|
|
TargetEntry* tle = NULL;
|
|
Relation rel;
|
|
|
|
/*
|
|
* The rewriter should have already ensured that the TLEs are in correct
|
|
* order; but we have to insert TLEs for any missing attributes.
|
|
*
|
|
* Scan the tuple description in the relation's relcache entry to make
|
|
* sure we have all the user attributes in the right order. We assume
|
|
* that the rewriter already acquired at least AccessShareLock on the
|
|
* relation, so we need no lock here.
|
|
*/
|
|
rel = heap_open(getrelid(result_relation, range_table), NoLock);
|
|
|
|
Assert(rel->rd_rel->relkind == RELKIND_RELATION);
|
|
|
|
parsetree->targetList = expandTargetTL(parsetree->targetList, parsetree);
|
|
|
|
/*
|
|
* Emit CTID so that executor can find the row to update or delete.
|
|
*/
|
|
var = makeVar(parsetree->mergeTarget_relation, SelfItemPointerAttributeNumber, TIDOID, -1, InvalidOid, 0);
|
|
|
|
attrname = "ctid";
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
|
|
/* We need add xc_node_id for MPP cluster mode, but only ctid for single datanode */
|
|
if (IS_PGXC_COORDINATOR) {
|
|
/*
|
|
* Emit xc_node_id so that executor can find the row to update or delete.
|
|
*/
|
|
var = makeVar(parsetree->mergeTarget_relation, XC_NodeIdAttributeNumber, INT4OID, -1, InvalidOid, 0);
|
|
|
|
attrname = "xc_node_id";
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
|
|
/*
|
|
* If we are dealing with partitioned table, then emit TABLEOID so that
|
|
* executor can find the partition the row belongs to.
|
|
*/
|
|
if (RELATION_IS_PARTITIONED(rel) || RelationIsCUFormat(rel)) {
|
|
var = makeVar(parsetree->mergeTarget_relation, TableOidAttributeNumber, OIDOID, -1, InvalidOid, 0);
|
|
|
|
attrname = "tableoid";
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
if (RELATION_HAS_BUCKET(rel)) {
|
|
var = makeVar(parsetree->mergeTarget_relation, BucketIdAttributeNumber, INT2OID, -1, InvalidBktId, 0);
|
|
attrname = "tablebucketid";
|
|
tle = makeTargetEntry((Expr*)var, list_length(parsetree->targetList) + 1, pstrdup(attrname), true);
|
|
|
|
parsetree->targetList = lappend(parsetree->targetList, tle);
|
|
}
|
|
|
|
heap_close(rel, NoLock);
|
|
}
|
|
|
|
/*
|
|
* matchLocks -
|
|
* match the list of locks and returns the matching rules
|
|
*/
|
|
static List* matchLocks(CmdType event, RuleLock* rulelocks, int varno, Query* parsetree)
|
|
{
|
|
List* matching_locks = NIL;
|
|
int nlocks;
|
|
int i;
|
|
|
|
if (rulelocks == NULL)
|
|
return NIL;
|
|
|
|
if (parsetree->commandType != CMD_SELECT) {
|
|
if (linitial2_int(parsetree->resultRelations) != varno)
|
|
return NIL;
|
|
}
|
|
|
|
nlocks = rulelocks->numLocks;
|
|
|
|
for (i = 0; i < nlocks; i++) {
|
|
RewriteRule* oneLock = rulelocks->rules[i];
|
|
|
|
/*
|
|
* Suppress ON INSERT/UPDATE/DELETE rules that are disabled or
|
|
* configured to not fire during the current sessions replication
|
|
* role. ON SELECT rules will always be applied in order to keep views
|
|
* working even in LOCAL or REPLICA role.
|
|
*/
|
|
if (oneLock->event != CMD_SELECT) {
|
|
if (u_sess->attr.attr_common.SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA) {
|
|
if (oneLock->enabled == RULE_FIRES_ON_ORIGIN || oneLock->enabled == RULE_DISABLED)
|
|
continue;
|
|
} else { /* ORIGIN or LOCAL ROLE */
|
|
if (oneLock->enabled == RULE_FIRES_ON_REPLICA || oneLock->enabled == RULE_DISABLED)
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (oneLock->event == event) {
|
|
if (parsetree->commandType != CMD_SELECT ||
|
|
(oneLock->attrno == -1 ? rangeTableEntry_used((Node*)parsetree, varno, 0)
|
|
: attribute_used((Node*)parsetree, varno, oneLock->attrno, 0)))
|
|
matching_locks = lappend(matching_locks, oneLock);
|
|
}
|
|
}
|
|
|
|
return matching_locks;
|
|
}
|
|
|
|
/*
|
|
* ApplyRetrieveRule - expand an ON SELECT rule
|
|
*/
|
|
static Query* ApplyRetrieveRule(Query* parsetree, RewriteRule* rule, int rt_index, bool relation_level,
|
|
Relation relation, List* activeRIRs, bool forUpdatePushedDown)
|
|
{
|
|
Query* rule_action = NULL;
|
|
RangeTblEntry* rte = NULL;
|
|
RangeTblEntry* subrte = NULL;
|
|
RowMarkClause* rc = NULL;
|
|
bool is_flt_frame = parsetree->is_flt_frame;
|
|
/* b_format view sql security option use */
|
|
Oid checkAsUser = InvalidOid;
|
|
|
|
if (list_length(rule->actions) != 1) {
|
|
ereport(ERROR, (errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("expected just one rule action")));
|
|
}
|
|
|
|
if (rule->qual != NULL) {
|
|
ereport(
|
|
ERROR, (errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("cannot handle qualified ON SELECT rule")));
|
|
}
|
|
|
|
if (!relation_level) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE), errmsg("cannot handle per-attribute ON SELECT rule")));
|
|
}
|
|
|
|
if (rt_index == linitial2_int(parsetree->resultRelations)) {
|
|
/*
|
|
* We have a view as the result relation of the query, and it wasn't
|
|
* rewritten by any rule. This case is supported if there is an
|
|
* INSTEAD OF trigger that will trap attempts to insert/update/delete
|
|
* view rows. The executor will check that; for the moment just plow
|
|
* ahead. We have two cases:
|
|
*
|
|
* For INSERT, we needn't do anything. The unmodified RTE will serve
|
|
* fine as the result relation.
|
|
*
|
|
* For UPDATE/DELETE, we need to expand the view so as to have source
|
|
* data for the operation. But we also need an unmodified RTE to
|
|
* serve as the target. So, copy the RTE and add the copy to the
|
|
* rangetable. Note that the copy does not get added to the jointree.
|
|
* Also note that there's a hack in fireRIRrules to avoid calling this
|
|
* function again when it arrives at the copied RTE.
|
|
*/
|
|
if (parsetree->commandType == CMD_INSERT)
|
|
return parsetree;
|
|
else if (parsetree->commandType == CMD_UPDATE || parsetree->commandType == CMD_DELETE) {
|
|
RangeTblEntry* newrte = NULL;
|
|
|
|
rte = rt_fetch(rt_index, parsetree->rtable);
|
|
newrte = (RangeTblEntry*)copyObject(rte);
|
|
parsetree->rtable = (List*)lappend(parsetree->rtable, newrte);
|
|
linitial_int(parsetree->resultRelations) = list_length(parsetree->rtable);
|
|
parsetree->resultRelation = linitial_int(parsetree->resultRelations);
|
|
/*
|
|
* There's no need to do permissions checks twice, so wipe out the
|
|
* permissions info for the original RTE (we prefer to keep the
|
|
* bits set on the result RTE).
|
|
*/
|
|
rte->requiredPerms = 0;
|
|
rte->checkAsUser = InvalidOid;
|
|
rte->selectedCols = NULL;
|
|
rte->insertedCols = NULL;
|
|
rte->updatedCols = NULL;
|
|
rte->extraUpdatedCols = NULL;
|
|
|
|
/*
|
|
* For the most part, Vars referencing the view should remain as
|
|
* they are, meaning that they implicitly represent OLD values.
|
|
* But in the RETURNING list if any, we want such Vars to
|
|
* represent NEW values, so change them to reference the new RTE.
|
|
*
|
|
* Since ChangeVarNodes scribbles on the tree in-place, copy the
|
|
* RETURNING list first for safety.
|
|
*/
|
|
parsetree->returningList = (List*)copyObject(parsetree->returningList);
|
|
ChangeVarNodes((Node*)parsetree->returningList, rt_index, linitial2_int(parsetree->resultRelations), 0);
|
|
|
|
/* rtindex and vars in withCheckOptions also need to change */
|
|
parsetree->withCheckOptions = (List*)copyObject(parsetree->withCheckOptions);
|
|
ChangeVarNodes((Node*)parsetree->withCheckOptions, rt_index, linitial2_int(parsetree->resultRelations), 0);
|
|
|
|
/* Now, continue with expanding the original view RTE */
|
|
} else {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("unrecognized commandType: %d", (int)parsetree->commandType)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If FOR [KEY] UPDATE/SHARE of view, be sure we get right initial lock on the
|
|
* relations it references.
|
|
*/
|
|
rc = get_parse_rowmark(parsetree, rt_index);
|
|
forUpdatePushedDown = forUpdatePushedDown || (rc != NULL);
|
|
|
|
/*
|
|
* Make a modifiable copy of the view query, and acquire needed locks on
|
|
* the relations it mentions.
|
|
*/
|
|
rule_action = (Query*)copyObject(linitial(rule->actions));
|
|
|
|
AcquireRewriteLocks(rule_action, forUpdatePushedDown);
|
|
|
|
/*
|
|
* If FOR [KEY] UPDATE/SHARE of view, mark all the contained tables as implicit
|
|
* FOR [KEY] UPDATE/SHARE, the same as the parser would have done if the view's
|
|
* subquery had been written out explicitly.
|
|
*
|
|
* Note: we don't consider forUpdatePushedDown here; such marks will be
|
|
* made by recursing from the upper level in markQueryForLocking.
|
|
*/
|
|
if (rc != NULL)
|
|
markQueryForLocking(rule_action, (Node*)rule_action->jointree, rc->strength, rc->waitPolicy, true,
|
|
rc->waitSec);
|
|
|
|
/* Pass the is_flt_frame from parsetree to rule_action */
|
|
rule_action->is_flt_frame = is_flt_frame;
|
|
|
|
/*
|
|
* in B format database ,deal with security options
|
|
* cause checkAsUser shoule be seted as definers' oid
|
|
* we should do some check here ,after expand views' query definition
|
|
*/
|
|
|
|
/* get from here, before Recursive call this function, transform outside view first */
|
|
rte = rt_fetch(rt_index, parsetree->rtable);
|
|
|
|
if (DB_IS_CMPT(B_FORMAT) && rte->relkind == RELKIND_VIEW) {
|
|
if (RelationHasViewSecurityDefinerOption(relation)) {
|
|
checkAsUser = RelationGetOwner(relation);
|
|
} else if (RelationHasViewSecurityInvokerOption(relation)) {
|
|
/* for invoker ,if checkAsUser is seted as owner id, we shoule use it */
|
|
checkAsUser = rte->checkAsUser == InvalidOid ? GetUserId() : rte->checkAsUser;
|
|
} else {
|
|
/* default is definer in b format database */
|
|
checkAsUser = RelationGetOwner(relation);
|
|
}
|
|
/* set all relations' and functions' invoker information */
|
|
query_tree_walker((Query *)rule_action, (bool (*)())viewSecurityPassDown, (void *)&checkAsUser, QTW_EXAMINE_RTES);
|
|
} else if (RelationHasViewSecurityOption(relation)) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("SQL Security option should only used in view and B format database")));
|
|
}
|
|
|
|
/*
|
|
* Recursively expand any view references inside the view.
|
|
*
|
|
* Note: this must happen after markQueryForLocking. That way, any UPDATE
|
|
* permission bits needed for sub-views are initially applied to their
|
|
* RTE_RELATION RTEs by markQueryForLocking, and then transferred to their
|
|
* OLD rangetable entries by the action below (in a recursive call of this
|
|
* routine).
|
|
*/
|
|
rule_action = fireRIRrules(rule_action, activeRIRs, forUpdatePushedDown);
|
|
|
|
/*
|
|
* Refresh view SRFs
|
|
*
|
|
* If we create a view when enable_expr_fusion is off, SRFs will not be identified, everything will be okay.
|
|
* If user set the guc on later, we get an old rule_action, but actually we have the ability to identify
|
|
* SRFs and resolve them. We travel the tule_action to fix hasTargetSRFs in Query.
|
|
*
|
|
* More detail:
|
|
* rule_action
|
|
* hasTargetSRFs true
|
|
* parsetree->is_flt_frame true, it's ok
|
|
* parsetree->is_flt_frame false, modify hasTargetSRFs to false
|
|
* hasTargetSRFs false
|
|
* parsetree->is_flt_frame, walk and check if it has SRFs
|
|
* parsetree->is_flt_frame, it's ok
|
|
*/
|
|
if (u_sess->attr.attr_common.enable_expr_fusion && u_sess->attr.attr_sql.query_dop_tmp == 1) {
|
|
/* adjust the Query */
|
|
query_check_srf(rule_action);
|
|
}
|
|
|
|
/*
|
|
* Now, plug the view query in as a subselect, replacing the relation's
|
|
* original RTE.
|
|
*/
|
|
rte = rt_fetch(rt_index, parsetree->rtable);
|
|
|
|
rte->rtekind = RTE_SUBQUERY;
|
|
rte->relid = InvalidOid;
|
|
rte->security_barrier = RelationIsSecurityView(relation);
|
|
rte->subquery = rule_action;
|
|
rte->inh = false; /* must not be set for a subquery */
|
|
|
|
/*
|
|
* We move the view's permission check data down to its rangetable. The
|
|
* checks will actually be done against the OLD entry therein.
|
|
*/
|
|
subrte = rt_fetch(PRS2_OLD_VARNO, rule_action->rtable);
|
|
AssertEreport(subrte->relid == relation->rd_id, MOD_OPT, "");
|
|
subrte->requiredPerms = rte->requiredPerms;
|
|
subrte->checkAsUser = rte->checkAsUser;
|
|
subrte->selectedCols = rte->selectedCols;
|
|
subrte->insertedCols = rte->insertedCols;
|
|
subrte->updatedCols = rte->updatedCols;
|
|
subrte->extraUpdatedCols = rte->extraUpdatedCols;
|
|
|
|
rte->requiredPerms = 0; /* no permission check on subquery itself */
|
|
rte->checkAsUser = InvalidOid;
|
|
rte->selectedCols = NULL;
|
|
rte->insertedCols = NULL;
|
|
rte->updatedCols = NULL;
|
|
rte->extraUpdatedCols = NULL;
|
|
|
|
/*
|
|
* If FOR [KEY] UPDATE/SHARE of view, mark all the contained tables as implicit
|
|
* FOR [KEY] UPDATE/SHARE, the same as the parser would have done if the view's
|
|
* subquery had been written out explicitly.
|
|
*
|
|
* Note: we don't consider forUpdatePushedDown here; such marks will be
|
|
* made by recursing from the upper level in markQueryForLocking.
|
|
*/
|
|
if (rc != NULL)
|
|
markQueryForLocking(rule_action, (Node*)rule_action->jointree, rc->strength, rc->waitPolicy, true,
|
|
rc->waitSec);
|
|
|
|
return parsetree;
|
|
}
|
|
|
|
/*
|
|
* Recursively mark all relations used by a view as FOR [KEY] UPDATE/SHARE.
|
|
*
|
|
* This may generate an invalid query, eg if some sub-query uses an
|
|
* aggregate. We leave it to the planner to detect that.
|
|
*
|
|
* NB: this must agree with the parser's transformLockingClause() routine.
|
|
* However, unlike the parser we have to be careful not to mark a view's
|
|
* OLD and NEW rels for updating. The best way to handle that seems to be
|
|
* to scan the jointree to determine which rels are used.
|
|
*/
|
|
static void markQueryForLocking(Query* qry, Node* jtnode, LockClauseStrength strength, LockWaitPolicy waitPolicy, bool pushedDown,
|
|
int waitSec)
|
|
{
|
|
if (jtnode == NULL)
|
|
return;
|
|
if (IsA(jtnode, RangeTblRef)) {
|
|
int rti = ((RangeTblRef*)jtnode)->rtindex;
|
|
RangeTblEntry* rte = rt_fetch(rti, qry->rtable);
|
|
|
|
if (rte->rtekind == RTE_RELATION) {
|
|
applyLockingClause(qry, rti, strength, waitPolicy, pushedDown, waitSec);
|
|
rte->requiredPerms |= ACL_SELECT_FOR_UPDATE;
|
|
} else if (rte->rtekind == RTE_SUBQUERY) {
|
|
applyLockingClause(qry, rti, strength, waitPolicy, pushedDown, waitSec);
|
|
/* FOR UPDATE/SHARE of subquery is propagated to subquery's rels */
|
|
markQueryForLocking(rte->subquery, (Node*)rte->subquery->jointree, strength, waitPolicy, true,
|
|
waitSec);
|
|
}
|
|
/* other RTE types are unaffected by FOR UPDATE */
|
|
} else if (IsA(jtnode, FromExpr)) {
|
|
FromExpr* f = (FromExpr*)jtnode;
|
|
ListCell* l = NULL;
|
|
|
|
foreach (l, f->fromlist)
|
|
markQueryForLocking(qry, (Node*)lfirst(l), strength, waitPolicy, pushedDown, waitSec);
|
|
} else if (IsA(jtnode, JoinExpr)) {
|
|
JoinExpr* j = (JoinExpr*)jtnode;
|
|
|
|
markQueryForLocking(qry, j->larg, strength, waitPolicy, pushedDown, waitSec);
|
|
markQueryForLocking(qry, j->rarg, strength, waitPolicy, pushedDown, waitSec);
|
|
} else
|
|
ereport(ERROR,
|
|
(errmodule(MOD_OPT_REWRITE),
|
|
errcode(ERRCODE_DATA_CORRUPTED),
|
|
errmsg("unrecognized node type: %d", (int)nodeTag(jtnode))));
|
|
}
|
|
|
|
/*
|
|
* fireRIRonSubLink -
|
|
* Apply fireRIRrules() to each SubLink (subselect in expression) found
|
|
* in the given tree.
|
|
*
|
|
* NOTE: although this has the form of a walker, we cheat and modify the
|
|
* SubLink nodes in-place. It is caller's responsibility to ensure that
|
|
* no unwanted side-effects occur!
|
|
*
|
|
* This is unlike most of the other routines that recurse into subselects,
|
|
* because we must take control at the SubLink node in order to replace
|
|
* the SubLink's subselect link with the possibly-rewritten subquery.
|
|
*/
|
|
static bool fireRIRonSubLink(Node* node, List* activeRIRs)
|
|
{
|
|
if (node == NULL)
|
|
return false;
|
|
if (IsA(node, SubLink)) {
|
|
SubLink* sub = (SubLink*)node;
|
|
|
|
/* Do what we came for */
|
|
sub->subselect = (Node*)fireRIRrules((Query*)sub->subselect, activeRIRs, false);
|
|
/* Fall through to process lefthand args of SubLink */
|
|
}
|
|
|
|
/*
|
|
* Do NOT recurse into Query nodes, because fireRIRrules already processed
|
|
* subselects of subselects for us.
|
|
*/
|
|
return expression_tree_walker(node, (bool (*)())fireRIRonSubLink, (void*)activeRIRs);
|
|
}
|
|
|
|
/*
|
|
* fireRIRrules -
|
|
* Apply all RIR rules on each rangetable entry in a query
|
|
*/
|
|
static Query* fireRIRrules(Query* parsetree, List* activeRIRs, bool forUpdatePushedDown)
|
|
{
|
|
int origResultRelation = linitial2_int(parsetree->resultRelations);
|
|
int rt_index;
|
|
ListCell* lc = NULL;
|
|
|
|
/*
|
|
* don't try to convert this into a foreach loop, because rtable list can
|
|
* get changed each time through...
|
|
*/
|
|
rt_index = 0;
|
|
while (rt_index < list_length(parsetree->rtable)) {
|
|
RangeTblEntry* rte = NULL;
|
|
Relation rel;
|
|
List* locks = NIL;
|
|
RuleLock* rules = NULL;
|
|
RewriteRule* rule = NULL;
|
|
int i;
|
|
|
|
++rt_index;
|
|
|
|
rte = rt_fetch(rt_index, parsetree->rtable);
|
|
|
|
/*
|
|
* A subquery RTE can't have associated rules, so there's nothing to
|
|
* do to this level of the query, but we must recurse into the
|
|
* subquery to expand any rule references in it.
|
|
*/
|
|
if (rte->rtekind == RTE_SUBQUERY) {
|
|
rte->subquery = fireRIRrules(
|
|
rte->subquery, activeRIRs, (forUpdatePushedDown || get_parse_rowmark(parsetree, rt_index) != NULL));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Joins and other non-relation RTEs can be ignored completely.
|
|
*/
|
|
if (rte->rtekind != RTE_RELATION) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Always ignore RIR rules for materialized views referenced in
|
|
* queries. (This does not prevent refreshing MVs, since they aren't
|
|
* referenced in their own query definitions.)
|
|
*
|
|
* Note: in the future we might want to allow MVs to be conditionally
|
|
* expanded as if they were regular views, if they are not scannable.
|
|
* In that case this test would need to be postponed till after we've
|
|
* opened the rel, so that we could check its state.
|
|
*/
|
|
if (rte->relkind == RELKIND_MATVIEW) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If the table is not referenced in the query, then we ignore it.
|
|
* This prevents infinite expansion loop due to new rtable entries
|
|
* inserted by expansion of a rule. A table is referenced if it is
|
|
* part of the join set (a source table), or is referenced by any Var
|
|
* nodes, or is the result table.
|
|
*/
|
|
if (rt_index != linitial2_int(parsetree->resultRelations) &&
|
|
!rangeTableEntry_used((Node*)parsetree, rt_index, 0)) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Also, if this is a new result relation introduced by
|
|
* ApplyRetrieveRule, we don't want to do anything more with it.
|
|
*/
|
|
if (rt_index == linitial2_int(parsetree->resultRelations) && rt_index != origResultRelation) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We can use NoLock here since either the parser or
|
|
* AcquireRewriteLocks should have locked the rel already.
|
|
*/
|
|
rel = heap_open(rte->relid, NoLock);
|
|
|
|
/*
|
|
* Collect the RIR rules that we must apply
|
|
*/
|
|
rules = rel->rd_rules;
|
|
if (rules == NULL) {
|
|
heap_close(rel, NoLock);
|
|
continue;
|
|
}
|
|
for (i = 0; i < rules->numLocks; i++) {
|
|
rule = rules->rules[i];
|
|
if (rule->event != CMD_SELECT) {
|
|
continue;
|
|
}
|
|
|
|
if (rule->attrno > 0) {
|
|
/* per-attr rule; do we need it? */
|
|
if (!attribute_used((Node*)parsetree, rt_index, rule->attrno, 0))
|
|
continue;
|
|
}
|
|
|
|
locks = lappend(locks, rule);
|
|
}
|
|
|
|
/*
|
|
* If we found any, apply them --- but first check for recursion!
|
|
*/
|
|
if (locks != NIL) {
|
|
ListCell* l = NULL;
|
|
|
|
if (list_member_oid(activeRIRs, RelationGetRelid(rel))) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
|
errmsg(
|
|
"infinite recursion detected in rules for relation \"%s\"", RelationGetRelationName(rel))));
|
|
}
|
|
activeRIRs = lcons_oid(RelationGetRelid(rel), activeRIRs);
|
|
|
|
foreach (l, locks) {
|
|
rule = (RewriteRule*)lfirst(l);
|
|
|
|
parsetree = ApplyRetrieveRule(
|
|
parsetree, rule, rt_index, rule->attrno == -1, rel, activeRIRs, forUpdatePushedDown);
|
|
}
|
|
|
|
activeRIRs = list_delete_first(activeRIRs);
|
|
}
|
|
|
|
heap_close(rel, NoLock);
|
|
}
|
|
|
|
/* Recurse into subqueries in WITH */
|
|
foreach (lc, parsetree->cteList) {
|
|
CommonTableExpr* cte = (CommonTableExpr*)lfirst(lc);
|
|
|
|
cte->ctequery = (Node*)fireRIRrules((Query*)cte->ctequery, activeRIRs, false);
|
|
}
|
|
|
|
/*
|
|
* Recurse into sublink subqueries, too. But we already did the ones in
|
|
* the rtable and cteList.
|
|
*/
|
|
if (parsetree->hasSubLinks) {
|
|
(void)query_tree_walker(parsetree, (bool (*)())fireRIRonSubLink, (void*)activeRIRs, QTW_IGNORE_RC_SUBQUERIES);
|
|
}
|
|
|
|
/*
|
|
* Apply row level security policies. Do this work here because it
|
|
* requires special recursion detection if the new quals have sublink
|
|
* subqueries, and if we did it in the loop above query_tree_walker would
|
|
* then recurse into those quals a second time.
|
|
* Only bind R.L.S policies to plan on coordinator node like view. Currently
|
|
* R.L.S only suport SELECT, UPDATE, DELETE.
|
|
*/
|
|
bool SupportRlsOnNode = true;
|
|
#ifdef ENABLE_MULTIPLE_NODES
|
|
SupportRlsOnNode = IS_PGXC_COORDINATOR;
|
|
#endif
|
|
if (SupportRlsOnNode &&
|
|
((parsetree->commandType == CMD_SELECT) || (parsetree->commandType == CMD_UPDATE) ||
|
|
(parsetree->commandType == CMD_DELETE) || (parsetree->commandType == CMD_MERGE))) {
|
|
rt_index = 0;
|
|
foreach (lc, parsetree->rtable) {
|
|
RangeTblEntry* rte = (RangeTblEntry*)lfirst(lc);
|
|
List* securityQuals = NIL;
|
|
bool hasRowSecurity = false;
|
|
bool hasSubLink = false;
|
|
rt_index++;
|
|
|
|
/* Row-Level-Security policy can only applied to normal
|
|
* relation(include partitioned relation)
|
|
*/
|
|
if ((rte->rtekind != RTE_RELATION) || (rte->relkind != RELKIND_RELATION)) {
|
|
continue;
|
|
}
|
|
|
|
Relation targetTable = relation_open(rte->relid, NoLock);
|
|
/* Fetch all R.L.S security quals that must be applied to this RTE */
|
|
GetRlsPolicies(parsetree, rte, targetTable, &securityQuals, rt_index, hasRowSecurity, hasSubLink);
|
|
if (securityQuals != NIL) {
|
|
/*
|
|
* Add the new security barrier quals to the start of the RTE's
|
|
* list so that they get applied before any existing barrier quals
|
|
* (which would have come from a security-barrier view, and should
|
|
* get lower priority than RLS conditions on the table itself).
|
|
*/
|
|
if (hasSubLink) {
|
|
if (list_member_oid(activeRIRs, rte->relid)) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
|
errmsg("infinite recursion detected, please check the row level security "
|
|
"policies for relation \"%s\"",
|
|
RelationGetRelationName(targetTable))));
|
|
}
|
|
activeRIRs = lcons_oid(rte->relid, activeRIRs);
|
|
/*
|
|
* Get row level security policies just passed back securityQuals and
|
|
* there were SubLink, make sure we lock any relations which are referenced.
|
|
* These locks would normally be acquired by the parser, but securityQuals
|
|
* are added post-parsing.
|
|
*/
|
|
(void)acquireLocksOnSubLinks((Node*)securityQuals, NULL);
|
|
expression_tree_walker((Node*)securityQuals, (bool (*)())fireRIRonSubLink, (void*)activeRIRs);
|
|
activeRIRs = list_delete_first(activeRIRs);
|
|
parsetree->hasSubLinks = true;
|
|
}
|
|
rte->securityQuals = list_concat(securityQuals, rte->securityQuals);
|
|
}
|
|
|
|
/* For case CMD_MERGE, add securityQuals to MergeAction */
|
|
if (rt_index == linitial2_int(parsetree->resultRelations) && parsetree->commandType == CMD_MERGE &&
|
|
rte->securityQuals != NIL) {
|
|
ListCell *lc = NULL;
|
|
ListCell *next = NULL;
|
|
Expr *security_quals_expr = (Expr *)lfirst(list_head(rte->securityQuals));
|
|
for (lc = lnext(list_head(rte->securityQuals)); lc != NULL; lc = next) {
|
|
next = lnext(lc);
|
|
List *lst = list_make2(security_quals_expr, lfirst(lc));
|
|
security_quals_expr = makeBoolExpr(AND_EXPR, lst, -1);
|
|
}
|
|
|
|
foreach (lc, parsetree->mergeActionList) {
|
|
MergeAction *action = (MergeAction *)lfirst(lc);
|
|
if (action->commandType == CMD_UPDATE) {
|
|
if (action->qual == NULL) {
|
|
action->qual = (Node *)security_quals_expr;
|
|
} else {
|
|
List *qual_list = list_make2(security_quals_expr, action->qual);
|
|
action->qual = (Node *)makeBoolExpr(AND_EXPR, qual_list, -1);
|
|
}
|
|
rte->securityQuals = NIL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Update Query hasRowSecurity */
|
|
parsetree->hasRowSecurity = (hasRowSecurity || parsetree->hasRowSecurity);
|
|
relation_close(targetTable, NoLock);
|
|
}
|
|
}
|
|
return parsetree;
|
|
}
|
|
|
|
/*
|
|
* Modify the given query by adding 'AND rule_qual IS NOT TRUE' to its
|
|
* qualification. This is used to generate suitable "else clauses" for
|
|
* conditional INSTEAD rules. (Unfortunately we must use "x IS NOT TRUE",
|
|
* not just "NOT x" which the planner is much smarter about, else we will
|
|
* do the wrong thing when the qual evaluates to NULL.)
|
|
*
|
|
* The rule_qual may contain references to OLD or NEW. OLD references are
|
|
* replaced by references to the specified rt_index (the relation that the
|
|
* rule applies to). NEW references are only possible for INSERT and UPDATE
|
|
* queries on the relation itself, and so they should be replaced by copies
|
|
* of the related entries in the query's own targetlist.
|
|
*/
|
|
static Query* CopyAndAddInvertedQual(Query* parsetree, Node* rule_qual, int rt_index, CmdType event)
|
|
{
|
|
/* Don't scribble on the passed qual (it's in the relcache!) */
|
|
Node* new_qual = (Node*)copyObject(rule_qual);
|
|
|
|
/*
|
|
* In case there are subqueries in the qual, acquire necessary locks and
|
|
* fix any deleted JOIN RTE entries. (This is somewhat redundant with
|
|
* rewriteRuleAction, but not entirely ... consider restructuring so that
|
|
* we only need to process the qual this way once.)
|
|
*/
|
|
(void)acquireLocksOnSubLinks(new_qual, NULL);
|
|
|
|
/* Fix references to OLD */
|
|
ChangeVarNodes(new_qual, PRS2_OLD_VARNO, rt_index, 0);
|
|
/* Fix references to NEW */
|
|
if (event == CMD_INSERT || event == CMD_UPDATE)
|
|
new_qual = ReplaceVarsFromTargetList(new_qual,
|
|
PRS2_NEW_VARNO,
|
|
0,
|
|
rt_fetch(rt_index, parsetree->rtable),
|
|
parsetree->targetList,
|
|
(event == CMD_UPDATE) ?
|
|
REPLACEVARS_CHANGE_VARNO :
|
|
REPLACEVARS_SUBSTITUTE_NULL,
|
|
rt_index,
|
|
&parsetree->hasSubLinks);
|
|
/* And attach the fixed qual */
|
|
AddInvertedQual(parsetree, new_qual);
|
|
|
|
return parsetree;
|
|
}
|
|
/*
|
|
* Generated column can not be manually insert or updated.
|
|
*/
|
|
static void CheckGeneratedColConstraint(CmdType commandType, Form_pg_attribute attTup, const TargetEntry *newTle)
|
|
{
|
|
if (commandType == CMD_INSERT) {
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("cannot insert into column \"%s\"", NameStr(attTup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(attTup->attname))));
|
|
} else if (commandType == CMD_UPDATE && newTle) {
|
|
ereport(ERROR, (errmodule(MOD_GEN_COL), errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("column \"%s\" can only be updated to DEFAULT", NameStr(attTup->attname)),
|
|
errdetail("Column \"%s\" is a generated column.", NameStr(attTup->attname))));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* very same to pg's rewriteTargetListIU. we adapt it to use for MergeInto
|
|
*/
|
|
static List* rewriteTargetListMergeInto(
|
|
List* targetList, CmdType commandType, Relation target_relation, int result_rti, List** attrno_list)
|
|
{
|
|
TargetEntry** new_tles;
|
|
List* new_tlist = NIL;
|
|
List* junk_tlist = NIL;
|
|
Form_pg_attribute att_tup;
|
|
int attrno, next_junk_attrno, numattrs;
|
|
ListCell* temp = NULL;
|
|
|
|
if (attrno_list != NULL) /* initialize optional result list */
|
|
*attrno_list = NIL;
|
|
|
|
/*
|
|
* We process the normal (non-junk) attributes by scanning the input tlist
|
|
* once and transferring TLEs into an array, then scanning the array to
|
|
* build an output tlist. This avoids O(N^2) behavior for large numbers
|
|
* of attributes.
|
|
*
|
|
* Junk attributes are tossed into a separate list during the same tlist
|
|
* scan, then appended to the reconstructed tlist.
|
|
*/
|
|
numattrs = RelationGetNumberOfAttributes(target_relation);
|
|
new_tles = (TargetEntry**)palloc0(numattrs * sizeof(TargetEntry*));
|
|
next_junk_attrno = numattrs + 1;
|
|
|
|
foreach (temp, targetList) {
|
|
TargetEntry* old_tle = (TargetEntry*)lfirst(temp);
|
|
|
|
if (!old_tle->resjunk) {
|
|
/* Normal attr: stash it into new_tles[] */
|
|
attrno = old_tle->resno;
|
|
if (attrno < 1 || attrno > numattrs) {
|
|
ereport(ERROR, (errcode(ERRCODE_AMBIGUOUS_COLUMN), errmsg("bogus resno %d in targetlist", attrno)));
|
|
}
|
|
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* put attrno into attrno_list even if it's dropped */
|
|
if (attrno_list != NULL)
|
|
*attrno_list = lappend_int(*attrno_list, attrno);
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped)
|
|
continue;
|
|
|
|
/* Merge with any prior assignment to same attribute */
|
|
new_tles[attrno - 1] = process_matched_tle(old_tle, new_tles[attrno - 1], NameStr(att_tup->attname));
|
|
} else {
|
|
/*
|
|
* Copy all resjunk tlist entries to junk_tlist, and assign them
|
|
* resnos above the last real resno.
|
|
*
|
|
* Typical junk entries include ORDER BY or GROUP BY expressions
|
|
* (are these actually possible in an INSERT or UPDATE?), system
|
|
* attribute references, etc.
|
|
*/
|
|
/* Get the resno right, but don't copy unnecessarily */
|
|
if (old_tle->resno != next_junk_attrno) {
|
|
old_tle = flatCopyTargetEntry(old_tle);
|
|
old_tle->resno = next_junk_attrno;
|
|
}
|
|
junk_tlist = lappend(junk_tlist, old_tle);
|
|
next_junk_attrno++;
|
|
}
|
|
}
|
|
|
|
for (attrno = 1; attrno <= numattrs; attrno++) {
|
|
TargetEntry* new_tle = new_tles[attrno - 1];
|
|
bool apply_default = false;
|
|
|
|
att_tup = &target_relation->rd_att->attrs[attrno - 1];
|
|
|
|
/* We can (and must) ignore deleted attributes */
|
|
if (att_tup->attisdropped)
|
|
continue;
|
|
|
|
/*
|
|
* Handle the two cases where we need to insert a default expression:
|
|
* it's an INSERT and there's no tlist entry for the column, or the
|
|
* tlist entry is a DEFAULT placeholder node.
|
|
*/
|
|
apply_default = ((new_tle == NULL && commandType == CMD_INSERT) ||
|
|
(new_tle && new_tle->expr && IsA(new_tle->expr, SetToDefault)));
|
|
|
|
bool isGeneratedCol = ISGENERATEDCOL(target_relation->rd_att, attrno - 1);
|
|
|
|
|
|
if (isGeneratedCol) {
|
|
if (!apply_default) {
|
|
CheckGeneratedColConstraint(commandType, att_tup, new_tle);
|
|
}
|
|
/*
|
|
* stored generated column will be fixed in executor
|
|
*/
|
|
new_tle = NULL;
|
|
} else if (apply_default) {
|
|
Node* new_expr = NULL;
|
|
|
|
new_expr = build_column_default(target_relation, attrno, (commandType == CMD_INSERT));
|
|
|
|
/*
|
|
* If there is no default (ie, default is effectively NULL), we
|
|
* can omit the tlist entry in the INSERT case, since the planner
|
|
* can insert a NULL for itself, and there's no point in spending
|
|
* any more rewriter cycles on the entry. But in the UPDATE case
|
|
* we've got to explicitly set the column to NULL.
|
|
*/
|
|
if (new_expr == NULL) {
|
|
if (commandType == CMD_INSERT)
|
|
new_tle = NULL;
|
|
else {
|
|
new_expr = (Node*)makeConst(att_tup->atttypid,
|
|
-1,
|
|
att_tup->attcollation,
|
|
att_tup->attlen,
|
|
(Datum)0,
|
|
true, /* isnull */
|
|
att_tup->attbyval);
|
|
/* this is to catch a NOT NULL domain constraint */
|
|
new_expr = coerce_to_domain(
|
|
new_expr, InvalidOid, -1, att_tup->atttypid, COERCE_IMPLICIT_CAST, -1, false, false);
|
|
}
|
|
}
|
|
|
|
if (new_expr != NULL)
|
|
new_tle = makeTargetEntry((Expr*)new_expr, attrno, pstrdup(NameStr(att_tup->attname)), false);
|
|
}
|
|
|
|
if (new_tle != NULL)
|
|
new_tlist = lappend(new_tlist, new_tle);
|
|
}
|
|
|
|
pfree_ext(new_tles);
|
|
|
|
return list_concat(new_tlist, junk_tlist);
|
|
}
|
|
|
|
/*
|
|
* fireRules -
|
|
* Iterate through rule locks applying rules.
|
|
*
|
|
* Input arguments:
|
|
* parsetree - original query
|
|
* rt_index - RT index of result relation in original query
|
|
* event - type of rule event
|
|
* locks - list of rules to fire
|
|
* Output arguments:
|
|
* *instead_flag - set TRUE if any unqualified INSTEAD rule is found
|
|
* (must be initialized to FALSE)
|
|
* *returning_flag - set TRUE if we rewrite RETURNING clause in any rule
|
|
* (must be initialized to FALSE)
|
|
* *qual_product - filled with modified original query if any qualified
|
|
* INSTEAD rule is found (must be initialized to NULL)
|
|
* Return value:
|
|
* list of rule actions adjusted for use with this query
|
|
*
|
|
* Qualified INSTEAD rules generate their action with the qualification
|
|
* condition added. They also generate a modified version of the original
|
|
* query with the negated qualification added, so that it will run only for
|
|
* rows that the qualified action doesn't act on. (If there are multiple
|
|
* qualified INSTEAD rules, we AND all the negated quals onto a single
|
|
* modified original query.) We won't execute the original, unmodified
|
|
* query if we find either qualified or unqualified INSTEAD rules. If
|
|
* we find both, the modified original query is discarded too.
|
|
*/
|
|
static List* fireRules(Query* parsetree, int rt_index, CmdType event, List* locks, bool* instead_flag,
|
|
bool* returning_flag, Query** qual_product)
|
|
{
|
|
List* results = NIL;
|
|
ListCell* l = NULL;
|
|
|
|
foreach (l, locks) {
|
|
RewriteRule* rule_lock = (RewriteRule*)lfirst(l);
|
|
Node* event_qual = rule_lock->qual;
|
|
List* actions = rule_lock->actions;
|
|
QuerySource qsrc;
|
|
ListCell* r = NULL;
|
|
|
|
/* Determine correct QuerySource value for actions */
|
|
if (rule_lock->isInstead) {
|
|
if (event_qual != NULL)
|
|
qsrc = QSRC_QUAL_INSTEAD_RULE;
|
|
else {
|
|
qsrc = QSRC_INSTEAD_RULE;
|
|
*instead_flag = true; /* report unqualified INSTEAD */
|
|
}
|
|
} else
|
|
qsrc = QSRC_NON_INSTEAD_RULE;
|
|
|
|
if (qsrc == QSRC_QUAL_INSTEAD_RULE) {
|
|
/*
|
|
* If there are INSTEAD rules with qualifications, the original
|
|
* query is still performed. But all the negated rule
|
|
* qualifications of the INSTEAD rules are added so it does its
|
|
* actions only in cases where the rule quals of all INSTEAD rules
|
|
* are false. Think of it as the default action in a case. We save
|
|
* this in *qual_product so RewriteQuery() can add it to the query
|
|
* list after we mangled it up enough.
|
|
*
|
|
* If we have already found an unqualified INSTEAD rule, then
|
|
* *qual_product won't be used, so don't bother building it.
|
|
*/
|
|
if (!*instead_flag) {
|
|
if (*qual_product == NULL)
|
|
*qual_product = (Query*)copyObject(parsetree);
|
|
*qual_product = CopyAndAddInvertedQual(*qual_product, event_qual, rt_index, event);
|
|
}
|
|
}
|
|
|
|
/* Now process the rule's actions and add them to the result list */
|
|
foreach (r, actions) {
|
|
Query* rule_action = (Query*)lfirst(r);
|
|
|
|
if (rule_action->commandType == CMD_NOTHING)
|
|
continue;
|
|
|
|
rule_action = rewriteRuleAction(parsetree, rule_action, event_qual, rt_index, event, returning_flag);
|
|
rule_action->querySource = qsrc;
|
|
rule_action->canSetTag = false; /* might change later */
|
|
|
|
results = lappend(results, rule_action);
|
|
}
|
|
}
|
|
|
|
return results;
|
|
}
|
|
|
|
/*
|
|
* get_view_query - get the Query from a view's _RETURN rule.
|
|
*
|
|
* Caller should have verified that the relation is a view, and therefore
|
|
* we should find an ON SELECT action.
|
|
*
|
|
* Note that the pointer returned is into the relcache and therefore must
|
|
* be treated as read-only to the caller and not modified or scribbled on.
|
|
*/
|
|
Query* get_view_query(Relation view)
|
|
{
|
|
int i;
|
|
|
|
Assert(view->rd_rel->relkind == RELKIND_VIEW);
|
|
|
|
for (i = 0; i < view->rd_rules->numLocks; i++) {
|
|
RewriteRule *rule = view->rd_rules->rules[i];
|
|
|
|
if (rule->event == CMD_SELECT) {
|
|
/* A _RETURN rule should have only one action */
|
|
if (list_length(rule->actions) != 1)
|
|
ereport(ERROR, (errmsg("invalid _RETURN rule action specification")));
|
|
|
|
return (Query*)linitial(rule->actions);
|
|
}
|
|
}
|
|
|
|
ereport(ERROR, (errmsg("failed to find _RETURN rule for view")));
|
|
return NULL; /* keep compiler quiet */
|
|
}
|
|
|
|
/*
|
|
* view_has_instead_trigger - does view have an INSTEAD OF trigger for event?
|
|
*
|
|
* If it does, we don't want to treat it as auto-updatable. This test can't
|
|
* be folded into view_query_is_auto_updatable because it's not an error
|
|
* condition.
|
|
*/
|
|
bool view_has_instead_trigger(Relation view, CmdType event)
|
|
{
|
|
TriggerDesc *trigDesc = view->trigdesc;
|
|
|
|
switch (event) {
|
|
case CMD_INSERT:
|
|
if (trigDesc && trigDesc->trig_insert_instead_row)
|
|
return true;
|
|
break;
|
|
case CMD_UPDATE:
|
|
if (trigDesc && trigDesc->trig_update_instead_row)
|
|
return true;
|
|
break;
|
|
case CMD_DELETE:
|
|
if (trigDesc && trigDesc->trig_delete_instead_row)
|
|
return true;
|
|
break;
|
|
default:
|
|
ereport(ERROR, (errmsg("unrecognized CmdType: %d", (int)event)));
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* view_col_is_auto_updatable - test whether the specified column of a view
|
|
* is auto-updatable. Returns NULL (if the column can be updated) or a message
|
|
* string giving the reason that it cannot be.
|
|
*
|
|
* Note that the checks performed here are local to this view. We do not check
|
|
* whether the referenced column of the underlying base relation is updatable.
|
|
*/
|
|
static const char* view_col_is_auto_updatable(RangeTblRef* rtr, TargetEntry* tle)
|
|
{
|
|
Var* var = (Var*)tle->expr;
|
|
|
|
/*
|
|
* For now, the only updatable columns we support are those that are Vars
|
|
* referring to user columns of the underlying base relation.
|
|
*
|
|
* The view targetlist may contain resjunk columns (e.g., a view defined
|
|
* like "SELECT * FROM t ORDER BY a+b" is auto-updatable) but such columns
|
|
* are not auto-updatable, and in fact should never appear in the outer
|
|
* query's targetlist.
|
|
*/
|
|
if (tle->resjunk)
|
|
return gettext_noop("Junk view columns are not updatable.");
|
|
|
|
if (!IsA(var, Var) || var->varno != (unsigned int)rtr->rtindex || var->varlevelsup != 0)
|
|
return gettext_noop("View columns that are not columns of their base relation are not updatable.");
|
|
|
|
if (var->varattno < 0)
|
|
return gettext_noop("View columns that refer to system columns are not updatable.");
|
|
|
|
if (var->varattno == 0)
|
|
return gettext_noop("View columns that return whole-row references are not updatable.");
|
|
|
|
return NULL; /* the view column is updatable */
|
|
}
|
|
|
|
/*
|
|
* view_query_is_auto_updatable - test whether the specified view definition
|
|
* represents an auto-updatable view. Returns NULL (if the view can be updated)
|
|
* or a message string giving the reason that it cannot be.
|
|
*
|
|
* If check_cols is true, the view is required to have at least one updatable
|
|
* column (necessary for INSERT/UPDATE). Otherwise the view's columns are not
|
|
* checked for updatability. See also view_cols_are_auto_updatable.
|
|
*
|
|
* Note that the checks performed here are only based on the view definition.
|
|
* We do not check whether any base relations referred to by the view are
|
|
* updatable.
|
|
*/
|
|
const char* view_query_is_auto_updatable(Query *viewquery, bool check_cols)
|
|
{
|
|
RangeTblRef* rtr = NULL;
|
|
RangeTblEntry* base_rte = NULL;
|
|
|
|
/*----------
|
|
* Check if the view is simply updatable. According to SQL-92 this means:
|
|
* - No DISTINCT clause.
|
|
* - Each TLE is a column reference, and each column appears at most once.
|
|
* - FROM contains exactly one base relation.
|
|
* - No GROUP BY or HAVING clauses.
|
|
* - No set operations (UNION, INTERSECT or EXCEPT).
|
|
* - No sub-queries in the WHERE clause that reference the target table.
|
|
*
|
|
* We ignore that last restriction since it would be complex to enforce
|
|
* and there isn't any actual benefit to disallowing sub-queries. (The
|
|
* semantic issues that the standard is presumably concerned about don't
|
|
* arise in Postgres, since any such sub-query will not see any updates
|
|
* executed by the outer query anyway, thanks to MVCC snapshotting.)
|
|
*
|
|
* We also relax the second restriction by supporting part of SQL:1999
|
|
* feature T111, which allows for a mix of updatable and non-updatable
|
|
* columns, provided that an INSERT or UPDATE doesn't attempt to assign to
|
|
* a non-updatable column.
|
|
*
|
|
* In addition we impose these constraints, involving features that are
|
|
* not part of SQL-92:
|
|
* - No CTEs (WITH clauses).
|
|
* - No OFFSET or LIMIT clauses (this matches a SQL:2008 restriction).
|
|
* - No system columns (including whole-row references) in the tlist.
|
|
* - No window functions in the tlist.
|
|
* - No set-returning functions in the tlist.
|
|
*
|
|
* Note that we do these checks without recursively expanding the view.
|
|
* If the base relation is a view, we'll recursively deal with it later.
|
|
*----------
|
|
*/
|
|
if (viewquery->distinctClause != NIL)
|
|
return gettext_noop("Views containing DISTINCT are not automatically updatable.");
|
|
|
|
if (viewquery->groupClause != NIL)
|
|
return gettext_noop("Views containing GROUP BY are not automatically updatable.");
|
|
|
|
if (viewquery->havingQual != NULL)
|
|
return gettext_noop("Views containing HAVING are not automatically updatable.");
|
|
|
|
if (viewquery->setOperations != NULL)
|
|
return gettext_noop("Views containing UNION, INTERSECT or EXCEPT are not automatically updatable.");
|
|
|
|
if (viewquery->cteList != NIL)
|
|
return gettext_noop("Views containing WITH are not automatically updatable.");
|
|
|
|
if (viewquery->limitOffset != NULL || viewquery->limitCount != NULL)
|
|
return gettext_noop("Views containing LIMIT or OFFSET are not automatically updatable.");
|
|
|
|
/*
|
|
* We must not allow window functions or set returning functions in the
|
|
* targetlist. Otherwise we might end up inserting them into the quals of
|
|
* the main query. We must also check for aggregates in the targetlist in
|
|
* case they appear without a GROUP BY.
|
|
*
|
|
* These restrictions ensure that each row of the view corresponds to a
|
|
* unique row in the underlying base relation.
|
|
*/
|
|
if (viewquery->hasAggs)
|
|
return gettext_noop("Views that return aggregate functions are not automatically updatable.");
|
|
|
|
if (viewquery->hasWindowFuncs)
|
|
return gettext_noop("Views that return window functions are not automatically updatable.");
|
|
|
|
if (expression_returns_set((Node *) viewquery->targetList))
|
|
return gettext_noop("Views that return set-returning functions are not automatically updatable.");
|
|
|
|
/*
|
|
* The view query should select from a single base relation, which must be
|
|
* a table or another view.
|
|
*/
|
|
if (list_length(viewquery->jointree->fromlist) != 1)
|
|
return gettext_noop("Views that do not select from a single table or view are not automatically updatable.");
|
|
|
|
rtr = (RangeTblRef*)linitial(viewquery->jointree->fromlist);
|
|
if (!IsA(rtr, RangeTblRef))
|
|
return gettext_noop("Views that do not select from a single table or view are not automatically updatable.");
|
|
|
|
base_rte = rt_fetch(rtr->rtindex, viewquery->rtable);
|
|
if (base_rte->rtekind != RTE_RELATION || (base_rte->relkind != RELKIND_RELATION &&
|
|
base_rte->relkind != RELKIND_FOREIGN_TABLE && base_rte->relkind != RELKIND_VIEW))
|
|
return gettext_noop("Views that do not select from a single table or view are not automatically updatable.");
|
|
|
|
/*
|
|
* Check that the view has at least one updatable column. This is required
|
|
* for INSERT/UPDATE but not for DELETE.
|
|
*/
|
|
if (check_cols) {
|
|
ListCell* cell= NULL;
|
|
bool found = false;
|
|
|
|
foreach (cell, viewquery->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(cell);
|
|
|
|
if (view_col_is_auto_updatable(rtr, tle) == NULL) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
return gettext_noop("Views that have no updatable columns are not automatically updatable.");
|
|
}
|
|
|
|
return NULL; /* the view is simply updatable */
|
|
}
|
|
|
|
/*
|
|
* view_cols_are_auto_updatable - test whether all of the required columns of
|
|
* an auto-updatable view are actually updatable. Returns NULL (if all the
|
|
* required columns can be updated) or a message string giving the reason that
|
|
* they cannot be.
|
|
*
|
|
* This should be used for INSERT/UPDATE to ensure that we don't attempt to
|
|
* assign to any non-updatable columns.
|
|
*
|
|
* Additionally it may be used to retrieve the set of updatable columns in the
|
|
* view, or if one or more of the required columns is not updatable, the name
|
|
* of the first offending non-updatable column.
|
|
*
|
|
* The caller must have already verified that this is an auto-updatable view
|
|
* using view_query_is_auto_updatable.
|
|
*
|
|
* Note that the checks performed here are only based on the view definition.
|
|
* We do not check whether the referenced columns of the base relation are
|
|
* updatable.
|
|
*/
|
|
static const char* view_cols_are_auto_updatable(Query *viewquery, Bitmapset *required_cols,
|
|
Bitmapset **updatable_cols, char **non_updatable_col)
|
|
{
|
|
RangeTblRef* rtr = NULL;
|
|
AttrNumber col;
|
|
ListCell* cell = NULL;
|
|
|
|
/*
|
|
* The caller should have verified that this view is auto-updatable and
|
|
* so there should be a single base relation.
|
|
*/
|
|
Assert(list_length(viewquery->jointree->fromlist) == 1);
|
|
rtr = (RangeTblRef *) linitial(viewquery->jointree->fromlist);
|
|
Assert(IsA(rtr, RangeTblRef));
|
|
|
|
/* Initialize the optional return values */
|
|
if (updatable_cols != NULL)
|
|
*updatable_cols = NULL;
|
|
if (non_updatable_col != NULL)
|
|
*non_updatable_col = NULL;
|
|
|
|
/* Test each view column for updatability */
|
|
col = -FirstLowInvalidHeapAttributeNumber;
|
|
foreach (cell, viewquery->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(cell);
|
|
const char* col_update_detail;
|
|
|
|
col++;
|
|
col_update_detail = view_col_is_auto_updatable(rtr, tle);
|
|
|
|
if (col_update_detail == NULL) {
|
|
/* The column is updatable */
|
|
if (updatable_cols != NULL)
|
|
*updatable_cols = bms_add_member(*updatable_cols, col);
|
|
} else if (bms_is_member(col, required_cols)) {
|
|
/* The required column is not updatable */
|
|
if (non_updatable_col != NULL)
|
|
*non_updatable_col = tle->resname;
|
|
return col_update_detail;
|
|
}
|
|
}
|
|
|
|
return NULL; /* all the required view columns are updatable */
|
|
}
|
|
|
|
/*
|
|
* relation_is_updatable - determine which update events the specified
|
|
* relation supports.
|
|
*
|
|
* Note that views may contain a mix of updatable and non-updatable columns.
|
|
* For a view to support INSERT/UPDATE it must have at least one updatable
|
|
* column, but there is no such restriction for DELETE. If include_cols is
|
|
* non-NULL, then only the specified columns are considered when testing for
|
|
* updatability.
|
|
*
|
|
* This is used for the information_schema views, which have separate concepts
|
|
* of "updatable" and "trigger updatable". A relation is "updatable" if it
|
|
* can be updated without the need for triggers (either because it has a
|
|
* suitable RULE, or because it is simple enough to be automatically updated).
|
|
* A relation is "trigger updatable" if it has a suitable INSTEAD OF trigger.
|
|
* The SQL standard regards this as not necessarily updatable, presumably
|
|
* because there is no way of knowing what the trigger will actually do.
|
|
* The information_schema views therefore call this function with
|
|
* include_triggers = false. However, other callers might only care whether
|
|
* data-modifying SQL will work, so they can pass include_triggers = true
|
|
* to have trigger updatability included in the result.
|
|
*
|
|
* The return value is a bitmask of rule event numbers indicating which of
|
|
* the INSERT, UPDATE and DELETE operations are supported. (We do it this way
|
|
* so that we can test for UPDATE plus DELETE support in a single call.)
|
|
*/
|
|
int relation_is_updatable(Oid reloid, bool include_triggers, Bitmapset* include_cols)
|
|
{
|
|
int events = 0;
|
|
Relation rel;
|
|
RuleLock* rulelocks = NULL;
|
|
|
|
#define ALL_EVENTS ((1 << CMD_INSERT) | (1 << CMD_UPDATE) | (1 << CMD_DELETE))
|
|
|
|
rel = try_relation_open(reloid, AccessShareLock);
|
|
|
|
/*
|
|
* If the relation doesn't exist, return zero rather than throwing an
|
|
* error. This is helpful since scanning an information_schema view
|
|
* under MVCC rules can result in referencing rels that were just
|
|
* deleted according to a SnapshotNow probe.
|
|
*/
|
|
if (rel == NULL)
|
|
return 0;
|
|
|
|
/* If the relation is a table, it is always updatable */
|
|
if (rel->rd_rel->relkind == RELKIND_RELATION) {
|
|
relation_close(rel, AccessShareLock);
|
|
return ALL_EVENTS;
|
|
}
|
|
|
|
/* Look for unconditional DO INSTEAD rules, and note supported events */
|
|
rulelocks = rel->rd_rules;
|
|
if (rulelocks != NULL) {
|
|
int i;
|
|
|
|
for (i = 0; i < rulelocks->numLocks; i++) {
|
|
if (rulelocks->rules[i]->isInstead && rulelocks->rules[i]->qual == NULL) {
|
|
events |= ((1 << rulelocks->rules[i]->event) & ALL_EVENTS);
|
|
}
|
|
}
|
|
|
|
/* If we have rules for all events, we're done */
|
|
if (events == ALL_EVENTS) {
|
|
relation_close(rel, AccessShareLock);
|
|
return events;
|
|
}
|
|
}
|
|
|
|
/* Similarly look for INSTEAD OF triggers, if they are to be included */
|
|
if (include_triggers) {
|
|
TriggerDesc *trigDesc = rel->trigdesc;
|
|
|
|
if (trigDesc) {
|
|
if (trigDesc->trig_insert_instead_row)
|
|
events |= (1 << CMD_INSERT);
|
|
if (trigDesc->trig_update_instead_row)
|
|
events |= (1 << CMD_UPDATE);
|
|
if (trigDesc->trig_delete_instead_row)
|
|
events |= (1 << CMD_DELETE);
|
|
|
|
/* If we have triggers for all events, we're done */
|
|
if (events == ALL_EVENTS) {
|
|
relation_close(rel, AccessShareLock);
|
|
return events;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If this is a foreign table, check which update events it supports */
|
|
if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE) {
|
|
FdwRoutine *fdwroutine = GetFdwRoutineForRelation(rel, false);
|
|
|
|
if (fdwroutine->IsForeignRelUpdatable != NULL)
|
|
events |= fdwroutine->IsForeignRelUpdatable(rel);
|
|
else {
|
|
/* Assume presence of executor functions is sufficient */
|
|
if (fdwroutine->ExecForeignInsert != NULL)
|
|
events |= (1 << CMD_INSERT);
|
|
if (fdwroutine->ExecForeignUpdate != NULL)
|
|
events |= (1 << CMD_UPDATE);
|
|
if (fdwroutine->ExecForeignDelete != NULL)
|
|
events |= (1 << CMD_DELETE);
|
|
}
|
|
|
|
relation_close(rel, AccessShareLock);
|
|
return events;
|
|
}
|
|
|
|
/* Check if this is an automatically updatable view */
|
|
if (rel->rd_rel->relkind == RELKIND_VIEW) {
|
|
Query* viewquery = get_view_query(rel);
|
|
|
|
if (view_query_is_auto_updatable(viewquery, false) == NULL) {
|
|
Bitmapset* updatable_cols;
|
|
int auto_events;
|
|
RangeTblRef* rtr;
|
|
RangeTblEntry* base_rte;
|
|
Oid baseoid;
|
|
|
|
/*
|
|
* Determine which of the view's columns are updatable. If there
|
|
* are none within the set of of columns we are looking at, then
|
|
* the view doesn't support INSERT/UPDATE, but it may still
|
|
* support DELETE.
|
|
*/
|
|
view_cols_are_auto_updatable(viewquery, NULL, &updatable_cols, NULL);
|
|
|
|
if (include_cols != NULL)
|
|
updatable_cols = bms_int_members(updatable_cols, include_cols);
|
|
|
|
if (bms_is_empty(updatable_cols))
|
|
auto_events = (1 << CMD_DELETE); /* May support DELETE */
|
|
else
|
|
auto_events = ALL_EVENTS; /* May support all events */
|
|
|
|
/*
|
|
* The base relation must also support these update commands.
|
|
* Tables are always updatable, but for any other kind of base
|
|
* relation we must do a recursive check limited to the columns
|
|
* referenced by the locally updatable columns in this view.
|
|
*/
|
|
rtr = (RangeTblRef*)linitial(viewquery->jointree->fromlist);
|
|
base_rte = rt_fetch(rtr->rtindex, viewquery->rtable);
|
|
Assert(base_rte->rtekind == RTE_RELATION);
|
|
|
|
if (base_rte->relkind != RELKIND_RELATION) {
|
|
baseoid = base_rte->relid;
|
|
include_cols = adjust_view_column_set(updatable_cols, viewquery->targetList);
|
|
auto_events &= relation_is_updatable(baseoid,
|
|
include_triggers,
|
|
include_cols);
|
|
}
|
|
events |= auto_events;
|
|
}
|
|
|
|
}
|
|
|
|
/* If we reach here, the relation may support some update commands */
|
|
relation_close(rel, AccessShareLock);
|
|
return events;
|
|
}
|
|
|
|
/*
|
|
* adjust_view_column_set - map a set of column numbers according to targetlist
|
|
*
|
|
* This is used with simply-updatable views to map column-permissions sets for
|
|
* the view columns onto the matching columns in the underlying base relation.
|
|
* The targetlist is expected to be a list of plain Vars of the underlying
|
|
* relation (as per the checks above in view_query_is_auto_updatable).
|
|
*/
|
|
static Bitmapset* adjust_view_column_set(Bitmapset* cols, List* targetlist)
|
|
{
|
|
Bitmapset* result = NULL;
|
|
Bitmapset* tmpcols = NULL;
|
|
AttrNumber col;
|
|
|
|
tmpcols = bms_copy(cols);
|
|
while ((col = bms_first_member(tmpcols)) >= 0) {
|
|
/* bit numbers are offset by FirstLowInvalidHeapAttributeNumber */
|
|
AttrNumber attno = col + FirstLowInvalidHeapAttributeNumber;
|
|
|
|
if (attno == InvalidAttrNumber) {
|
|
/*
|
|
* There's a whole-row reference to the view. For permissions
|
|
* purposes, treat it as a reference to each column available from
|
|
* the view. (We should *not* convert this to a whole-row
|
|
* reference to the base relation, since the view may not touch
|
|
* all columns of the base relation.)
|
|
*/
|
|
ListCell* lc = NULL;
|
|
|
|
foreach(lc, targetlist) {
|
|
TargetEntry* tle = (TargetEntry *) lfirst(lc);
|
|
Var* var = NULL;
|
|
|
|
if (tle->resjunk)
|
|
continue;
|
|
var = (Var*)tle->expr;
|
|
Assert(IsA(var, Var));
|
|
result = bms_add_member(result, var->varattno - FirstLowInvalidHeapAttributeNumber);
|
|
}
|
|
} else {
|
|
/*
|
|
* Views do not have system columns, so we do not expect to see
|
|
* any other system attnos here. If we do find one, the error
|
|
* case will apply.
|
|
*/
|
|
TargetEntry* tle = get_tle_by_resno(targetlist, attno);
|
|
|
|
if (tle != NULL && !tle->resjunk && IsA(tle->expr, Var)) {
|
|
Var* var = (Var*)tle->expr;
|
|
|
|
result = bms_add_member(result, var->varattno - FirstLowInvalidHeapAttributeNumber);
|
|
} else
|
|
ereport(ERROR, (errmsg("attribute number %d not found in view targetlist", attno)));
|
|
}
|
|
}
|
|
bms_free(tmpcols);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* If target relation is already exist in parsetree, make new_rte
|
|
* and new_rt_index point to it, and return true.
|
|
*/
|
|
static bool setNewRteIfExist(Query* parsetree, Oid base_relid, int result_relation, RangeTblEntry** new_rte,
|
|
int* new_rt_index)
|
|
{
|
|
int rtindex = 1;
|
|
bool targetIsExist = false;
|
|
ListCell* lc = NULL;
|
|
|
|
foreach (lc, parsetree->rtable) {
|
|
RangeTblEntry* rte = (RangeTblEntry*)lfirst(lc);
|
|
|
|
if (base_relid == rte->relid && rtindex != result_relation) {
|
|
parsetree->resultRelations = list_delete_int(parsetree->resultRelations, result_relation);
|
|
*new_rt_index = rtindex;
|
|
*new_rte = rte;
|
|
|
|
targetIsExist = true;
|
|
break;
|
|
}
|
|
rtindex++;
|
|
}
|
|
|
|
if (targetIsExist) {
|
|
ListCell* l = NULL;
|
|
foreach (l, parsetree->jointree->fromlist) {
|
|
RangeTblRef* rtf = (RangeTblRef*)lfirst(l);
|
|
|
|
if (rtf->rtindex == result_relation) {
|
|
parsetree->jointree->fromlist = list_delete_ptr(parsetree->jointree->fromlist, rtf);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return targetIsExist;
|
|
}
|
|
|
|
/*
|
|
* rewriteTargetView -
|
|
* Attempt to rewrite a query where the target relation is a view, so that
|
|
* the view's base relation becomes the target relation.
|
|
*
|
|
* Note that the base relation here may itself be a view, which may or may not
|
|
* have INSTEAD OF triggers or rules to handle the update. That is handled by
|
|
* the recursion in RewriteQuery.
|
|
*
|
|
* For multiple modifying, result_relation is needed to indicate which modified
|
|
* view to rewrite.
|
|
*/
|
|
static Query* rewriteTargetView(Query *parsetree, Relation view, int result_relation)
|
|
{
|
|
Query* viewquery = NULL;
|
|
const char* auto_update_detail = NULL;
|
|
RangeTblRef* rtr = NULL;
|
|
int base_rt_index;
|
|
int new_rt_index;
|
|
RangeTblEntry* base_rte = NULL;
|
|
RangeTblEntry* view_rte = NULL;
|
|
RangeTblEntry* new_rte = NULL;
|
|
Relation base_rel;
|
|
List* view_targetlist = NIL;
|
|
ListCell* lc = NULL;
|
|
|
|
/*
|
|
* Get the Query from the view's ON SELECT rule. We're going to munge the
|
|
* Query to change the view's base relation into the target relation,
|
|
* along with various other changes along the way, so we need to make a
|
|
* copy of it (get_view_query() returns a pointer into the relcache, so we
|
|
* have to treat it as read-only).
|
|
*/
|
|
viewquery = (Query*)copyObject(get_view_query(view));
|
|
|
|
auto_update_detail = view_query_is_auto_updatable(viewquery, parsetree->commandType != CMD_DELETE);
|
|
|
|
if (auto_update_detail) {
|
|
/* messages here should match execMain.c's CheckValidResultRel */
|
|
switch (parsetree->commandType) {
|
|
case CMD_INSERT:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot insert into view \"%s\"", RelationGetRelationName(view)),
|
|
errdetail_internal("%s", _(auto_update_detail)),
|
|
errhint("To enable inserting into the view, provide an INSTEAD OF INSERT trigger or "
|
|
"an unconditional ON INSERT DO INSTEAD rule.")));
|
|
break;
|
|
case CMD_UPDATE:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot update view \"%s\"", RelationGetRelationName(view)),
|
|
errdetail_internal("%s", _(auto_update_detail)),
|
|
errhint("To enable updating the view, provide an INSTEAD OF UPDATE trigger or "
|
|
"an unconditional ON UPDATE DO INSTEAD rule.")));
|
|
break;
|
|
case CMD_DELETE:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot delete from view \"%s\"", RelationGetRelationName(view)),
|
|
errdetail_internal("%s", _(auto_update_detail)),
|
|
errhint("To enable deleting from the view, provide an INSTEAD OF DELETE trigger or "
|
|
"an unconditional ON DELETE DO INSTEAD rule.")));
|
|
break;
|
|
default:
|
|
ereport(ERROR, (errmsg("unrecognized CmdType: %d", (int)parsetree->commandType)));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For INSERT/UPDATE the modified columns must all be updatable. Note that
|
|
* we get the modified columns from the query's targetlist, not from the
|
|
* result RTE's modifiedCols set, since rewriteTargetListIU may have added
|
|
* additional targetlist entries for view defaults, and these must also be
|
|
* updatable.
|
|
*/
|
|
if (parsetree->commandType != CMD_DELETE) {
|
|
Bitmapset *modified_cols = NULL;
|
|
char* non_updatable_col = NULL;
|
|
|
|
foreach (lc, parsetree->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(lc);
|
|
|
|
if ((tle->rtindex == 0 || tle->rtindex == (Index)result_relation) && !tle->resjunk)
|
|
modified_cols = bms_add_member(modified_cols, tle->resno - FirstLowInvalidHeapAttributeNumber);
|
|
}
|
|
|
|
auto_update_detail = view_cols_are_auto_updatable(viewquery, modified_cols, NULL, &non_updatable_col);
|
|
if (auto_update_detail) {
|
|
/*
|
|
* This is a different error, caused by an attempt to update a
|
|
* non-updatable column in an otherwise updatable view.
|
|
*/
|
|
switch (parsetree->commandType) {
|
|
case CMD_INSERT:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot insert into column \"%s\" of view \"%s\"", non_updatable_col,
|
|
RelationGetRelationName(view)),
|
|
errdetail_internal("%s", _(auto_update_detail))));
|
|
break;
|
|
case CMD_UPDATE:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot update column \"%s\" of view \"%s\"", non_updatable_col,
|
|
RelationGetRelationName(view)),
|
|
errdetail_internal("%s", _(auto_update_detail))));
|
|
break;
|
|
default:
|
|
elog(ERROR, "unrecognized CmdType: %d", (int)parsetree->commandType);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Locate RTE describing the view in the outer query */
|
|
view_rte = rt_fetch(result_relation, parsetree->rtable);
|
|
|
|
/*
|
|
* If we get here, view_query_is_auto_updatable() has verified that the
|
|
* view contains a single base relation.
|
|
*/
|
|
|
|
Assert(list_length(viewquery->jointree->fromlist) == 1);
|
|
rtr = (RangeTblRef*)linitial(viewquery->jointree->fromlist);
|
|
Assert(IsA(rtr, RangeTblRef));
|
|
|
|
base_rt_index = rtr->rtindex;
|
|
base_rte = rt_fetch(base_rt_index, viewquery->rtable);
|
|
Assert(base_rte->rtekind == RTE_RELATION);
|
|
|
|
/*
|
|
* Up to now, the base relation hasn't been touched at all in our query.
|
|
* We need to acquire lock on it before we try to do anything with it.
|
|
* (The subsequent recursive call of RewriteQuery will suppose that we
|
|
* already have the right lock!) Since it will become the query target
|
|
* relation, RowExclusiveLock is always the right thing.
|
|
*/
|
|
base_rel = heap_open(base_rte->relid, RowExclusiveLock);
|
|
|
|
/*
|
|
* While we have the relation open, update the RTE's relkind, just in case
|
|
* it changed since this view was made (cf. AcquireRewriteLocks).
|
|
*/
|
|
base_rte->relkind = base_rel->rd_rel->relkind;
|
|
|
|
heap_close(base_rel, NoLock);
|
|
|
|
/*
|
|
* If the view query contains any sublink subqueries then we need to also
|
|
* acquire locks on any relations they refer to. We know that there won't
|
|
* be any subqueries in the range table or CTEs, so we can skip those, as
|
|
* in AcquireRewriteLocks.
|
|
*/
|
|
if (viewquery->hasSubLinks) {
|
|
(void)query_tree_walker(viewquery, (bool (*)())acquireLocksOnSubLinks,NULL, QTW_IGNORE_RC_SUBQUERIES);
|
|
}
|
|
|
|
/*
|
|
* Create a new target RTE describing the base relation, and add it to the
|
|
* outer query's rangetable. (What's happening in the next few steps is
|
|
* very much like what the planner would do to "pull up" the view into the
|
|
* outer query. Perhaps someday we should refactor things enough so that
|
|
* we can share code with the planner.)
|
|
*
|
|
* We will not do so if basic relation of view is already exist in rtables,
|
|
* cause multiple-relation modifying include views is allowed.
|
|
*/
|
|
if (!setNewRteIfExist(parsetree, base_rte->relid, result_relation, &new_rte, &new_rt_index)) {
|
|
new_rte = base_rte;
|
|
parsetree->rtable = lappend(parsetree->rtable, new_rte);
|
|
new_rt_index = list_length(parsetree->rtable);
|
|
}
|
|
|
|
/*
|
|
* Adjust the view's targetlist Vars to reference the new target RTE, ie
|
|
* make their varnos be new_rt_index instead of base_rt_index. There can
|
|
* be no Vars for other rels in the tlist, so this is sufficient to pull
|
|
* up the tlist expressions for use in the outer query. The tlist will
|
|
* provide the replacement expressions used by ReplaceVarsFromTargetList
|
|
* below.
|
|
*/
|
|
view_targetlist = viewquery->targetList;
|
|
|
|
ChangeVarNodes((Node*)view_targetlist, base_rt_index, new_rt_index, 0);
|
|
|
|
/*
|
|
* Mark the new target RTE for the permissions checks that we want to
|
|
* enforce against the view owner, as distinct from the query caller. At
|
|
* the relation level, require the same INSERT/UPDATE/DELETE permissions
|
|
* that the query caller needs against the view. We drop the ACL_SELECT
|
|
* bit that is presumably in new_rte->requiredPerms initially.
|
|
*
|
|
* Note: the original view RTE remains in the query's rangetable list.
|
|
* Although it will be unused in the query plan, we need it there so that
|
|
* the executor still performs appropriate permissions checks for the
|
|
* query caller's use of the view.
|
|
*/
|
|
new_rte->checkAsUser = view->rd_rel->relowner;
|
|
new_rte->requiredPerms = view_rte->requiredPerms;
|
|
|
|
/*
|
|
* Now for the per-column permissions bits.
|
|
*
|
|
* Initially, new_rte contains selectedCols permission check bits for all
|
|
* base-rel columns referenced by the view, but since the view is a SELECT
|
|
* query its modifiedCols is empty. We set modifiedCols to include all
|
|
* the columns the outer query is trying to modify, adjusting the column
|
|
* numbers as needed. But we leave selectedCols as-is, so the view owner
|
|
* must have read permission for all columns used in the view definition,
|
|
* even if some of them are not read by the outer query. We could try to
|
|
* limit selectedCols to only columns used in the transformed query, but
|
|
* that does not correspond to what happens in ordinary SELECT usage of a
|
|
* view: all referenced columns must have read permission, even if
|
|
* optimization finds that some of them can be discarded during query
|
|
* transformation. The flattening we're doing here is an optional
|
|
* optimization, too. (If you are unpersuaded and want to change this,
|
|
* note that applying adjust_view_column_set to view_rte->selectedCols is
|
|
* clearly *not* the right answer, since that neglects base-rel columns
|
|
* used in the view's WHERE quals.)
|
|
*
|
|
* This step needs the modified view targetlist, so we have to do things
|
|
* in this order.
|
|
*/
|
|
new_rte->insertedCols = bms_add_members(new_rte->insertedCols,
|
|
adjust_view_column_set(view_rte->insertedCols, view_targetlist));
|
|
new_rte->updatedCols = bms_add_members(new_rte->updatedCols,
|
|
adjust_view_column_set(view_rte->updatedCols, view_targetlist));
|
|
new_rte->modifiedCols = bms_union(new_rte->insertedCols, new_rte->updatedCols);
|
|
|
|
/*
|
|
* Move any security barrier quals from the view RTE onto the new target
|
|
* RTE. Any such quals should now apply to the new target RTE and will not
|
|
* reference the original view RTE in the rewritten query.
|
|
*/
|
|
new_rte->securityQuals = list_concat(new_rte->securityQuals, view_rte->securityQuals);
|
|
view_rte->securityQuals = NIL;
|
|
|
|
/*
|
|
* For UPDATE/DELETE, rewriteTargetListUD will have added a wholerow junk
|
|
* TLE for the view to the end of the targetlist, which we no longer need.
|
|
* Remove it to avoid unnecessary work when we process the targetlist.
|
|
* Note that when we recurse through rewriteQuery a new junk TLE will be
|
|
* added to allow the executor to find the proper row in the new target
|
|
* relation. (So, if we failed to do this, we might have multiple junk
|
|
* TLEs with the same name, which would be disastrous.)
|
|
*/
|
|
if (parsetree->commandType != CMD_INSERT) {
|
|
ListCell* res = NULL;
|
|
TargetEntry* tle = NULL;
|
|
|
|
foreach (res, parsetree->targetList) {
|
|
tle = (TargetEntry*)lfirst(res);
|
|
if (tle->rtindex == (Index)result_relation && strcmp(tle->resname, "wholerow") == 0) {
|
|
parsetree->targetList = list_delete_ptr(parsetree->targetList, tle);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now update all Vars in the outer query that reference the view to
|
|
* reference the appropriate column of the base relation instead.
|
|
*/
|
|
parsetree = (Query*)ReplaceVarsFromTargetList((Node*)parsetree,
|
|
result_relation,
|
|
0,
|
|
view_rte,
|
|
view_targetlist,
|
|
REPLACEVARS_REPORT_ERROR,
|
|
0,
|
|
&parsetree->hasSubLinks);
|
|
|
|
/*
|
|
* Update all other RTI references in the query that point to the view
|
|
* (for example, parsetree->resultRelation itself) to point to the new
|
|
* base relation instead. Vars will not be affected since none of them
|
|
* reference parsetree->resultRelation any longer.
|
|
*/
|
|
ChangeVarNodes((Node*)parsetree, result_relation, new_rt_index, 0);
|
|
|
|
/*
|
|
* For INSERT/UPDATE we must also update resnos in the targetlist to refer
|
|
* to columns of the base relation, since those indicate the target
|
|
* columns to be affected.
|
|
*
|
|
* Note that this destroys the resno ordering of the targetlist, but that
|
|
* will be fixed when we recurse through rewriteQuery, which will invoke
|
|
* rewriteTargetListIU again on the updated targetlist.
|
|
*/
|
|
if (parsetree->commandType != CMD_DELETE) {
|
|
foreach(lc, parsetree->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(lc);
|
|
TargetEntry* view_tle = NULL;
|
|
|
|
if (tle->resjunk)
|
|
continue;
|
|
|
|
view_tle = get_tle_by_resno(view_targetlist, tle->resno);
|
|
if (view_tle != NULL && !view_tle->resjunk && IsA(view_tle->expr, Var))
|
|
tle->resno = ((Var*)view_tle->expr)->varattno;
|
|
else
|
|
ereport(ERROR, (errmsg("attribute number %d not found in view targetlist", tle->resno)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For UPDATE/DELETE, pull up any WHERE quals from the view. We know that
|
|
* any Vars in the quals must reference the one base relation, so we need
|
|
* only adjust their varnos to reference the new target (just the same as
|
|
* we did with the view targetlist).
|
|
*
|
|
* Note that there is special-case handling for the quals of a security
|
|
* barrier view, since they need to be kept separate from any user-supplied
|
|
* quals, so these quals are kept on the new target RTE.
|
|
* For INSERT, the view's quals can be ignored in the main query.
|
|
*/
|
|
if (parsetree->commandType != CMD_INSERT && viewquery->jointree->quals != NULL) {
|
|
Node* viewqual = (Node*)viewquery->jointree->quals;
|
|
|
|
ChangeVarNodes(viewqual, base_rt_index, new_rt_index, 0);
|
|
|
|
if (RelationIsSecurityView(view)) {
|
|
/*
|
|
* Note: the parsetree has been mutated, so the new_rte pointer is
|
|
* stale and needs to be re-computed.
|
|
*/
|
|
new_rte = rt_fetch(new_rt_index, parsetree->rtable);
|
|
new_rte->securityQuals = lcons(viewqual, new_rte->securityQuals);
|
|
|
|
/*
|
|
* Make sure that the query is marked correctly if the added qual
|
|
* has sublinks.
|
|
*/
|
|
if (!parsetree->hasSubLinks)
|
|
parsetree->hasSubLinks = checkExprHasSubLink(viewqual);
|
|
} else
|
|
AddQual(parsetree, (Node*)viewqual);
|
|
}
|
|
|
|
/*
|
|
* For INSERT/UPDATE, if the view has the WITH CHECK OPTION, or any parent
|
|
* view specified WITH CASCADED CHECK OPTION, add the quals from the view
|
|
* to the query's withCheckOptions list.
|
|
*/
|
|
if (parsetree->commandType != CMD_DELETE) {
|
|
bool has_wco = RelationHasCheckOption(view);
|
|
bool cascaded = RelationHasCascadedCheckOption(view);
|
|
|
|
/*
|
|
* If the parent view has a cascaded check option, treat this view as
|
|
* if it also had a cascaded check option.
|
|
*
|
|
* New WithCheckOptions are added to the start of the list, so if there
|
|
* is a cascaded check option, it will be the first item in the list.
|
|
*/
|
|
if (parsetree->withCheckOptions != NIL) {
|
|
WithCheckOption* parent_wco = (WithCheckOption*)linitial(parsetree->withCheckOptions);
|
|
|
|
if (parent_wco->cascaded) {
|
|
has_wco = true;
|
|
cascaded = true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add the new WithCheckOption to the start of the list, so that
|
|
* checks on inner views are run before checks on outer views, as
|
|
* required by the SQL standard.
|
|
*
|
|
* If the new check is CASCADED, we need to add it even if this view
|
|
* has no quals, since there may be quals on child views. A LOCAL
|
|
* check can be omitted if this view has no quals.
|
|
*/
|
|
if (has_wco && (cascaded || viewquery->jointree->quals != NULL)) {
|
|
WithCheckOption* wco = makeNode(WithCheckOption);
|
|
wco->viewname = pstrdup(RelationGetRelationName(view));
|
|
wco->qual = NULL;
|
|
wco->cascaded = cascaded;
|
|
wco->rtindex = new_rt_index;
|
|
|
|
parsetree->withCheckOptions = lcons(wco, parsetree->withCheckOptions);
|
|
|
|
if (viewquery->jointree->quals != NULL) {
|
|
wco->qual = (Node*)viewquery->jointree->quals;
|
|
ChangeVarNodes(wco->qual, base_rt_index, new_rt_index, 0);
|
|
|
|
/*
|
|
* Make sure that the query is marked correctly if the added
|
|
* qual has sublinks. We can skip this check if the query is
|
|
* already marked, or if the command is an UPDATE, in which
|
|
* case the same qual will have already been added, and this
|
|
* check will already have been done.
|
|
*/
|
|
if (!parsetree->hasSubLinks &&
|
|
parsetree->commandType != CMD_UPDATE)
|
|
parsetree->hasSubLinks = checkExprHasSubLink(wco->qual);
|
|
}
|
|
}
|
|
}
|
|
|
|
return parsetree;
|
|
}
|
|
|
|
void ereport_for_each_cmdtype(CmdType event, Relation rt_entry_relation)
|
|
{
|
|
switch (event) {
|
|
case CMD_INSERT:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot perform INSERT RETURNING on relation \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errhint("You need an unconditional ON INSERT DO INSTEAD rule with a RETURNING clause.")));
|
|
break;
|
|
case CMD_UPDATE:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot perform UPDATE RETURNING on relation \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errhint("You need an unconditional ON UPDATE DO INSTEAD rule with a RETURNING clause.")));
|
|
break;
|
|
case CMD_DELETE:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("cannot perform DELETE RETURNING on relation \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errhint("You need an unconditional ON DELETE DO INSTEAD rule with a RETURNING clause.")));
|
|
break;
|
|
default: {
|
|
ereport(
|
|
ERROR, (errcode(ERRCODE_UNEXPECTED_NODE_STATE), errmsg("unrecognized commandType: %d", (int)event)));
|
|
} break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* RewriteQuery -
|
|
* rewrites the query and apply the rules again on the queries rewritten
|
|
*
|
|
* rewrite_events is a list of open query-rewrite actions, so we can detect
|
|
* infinite recursion.
|
|
*/
|
|
static List* RewriteQuery(Query* parsetree, List* rewrite_events)
|
|
{
|
|
CmdType event = parsetree->commandType;
|
|
bool instead = false;
|
|
bool returning = false;
|
|
Query* qual_product = NULL;
|
|
List* rewritten = NIL;
|
|
ListCell* lc1 = NULL;
|
|
|
|
#ifdef PGXC
|
|
List* parsetree_list = NIL;
|
|
List* qual_product_list = NIL;
|
|
ListCell* pt_cell = NULL;
|
|
#endif
|
|
|
|
/*
|
|
* First, recursively process any insert/update/delete statements in WITH
|
|
* clauses. (We have to do this first because the WITH clauses may get
|
|
* copied into rule actions below.)
|
|
*/
|
|
foreach (lc1, parsetree->cteList) {
|
|
CommonTableExpr* cte = (CommonTableExpr*)lfirst(lc1);
|
|
Query* ctequery = (Query*)cte->ctequery;
|
|
List* newstuff = NIL;
|
|
|
|
AssertEreport(IsA(ctequery, Query), MOD_OPT, "");
|
|
|
|
if (ctequery->commandType == CMD_SELECT)
|
|
continue;
|
|
|
|
newstuff = RewriteQuery(ctequery, rewrite_events);
|
|
|
|
/*
|
|
* Currently we can only handle unconditional, single-statement DO
|
|
* INSTEAD rules correctly; we have to get exactly one Query out of
|
|
* the rewrite operation to stuff back into the CTE node.
|
|
*/
|
|
if (list_length(newstuff) == 1) {
|
|
/* Push the single Query back into the CTE node */
|
|
ctequery = (Query*)linitial(newstuff);
|
|
AssertEreport(IsA(ctequery, Query), MOD_OPT, "");
|
|
/* WITH queries should never be canSetTag */
|
|
AssertEreport(!ctequery->canSetTag, MOD_OPT, "");
|
|
cte->ctequery = (Node*)ctequery;
|
|
} else if (newstuff == NIL) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("DO INSTEAD NOTHING rules are not supported for data-modifying statements in WITH")));
|
|
} else {
|
|
ListCell* lc2 = NULL;
|
|
|
|
/* examine queries to determine which error message to issue */
|
|
foreach (lc2, newstuff) {
|
|
Query* q = (Query*)lfirst(lc2);
|
|
|
|
if (q->querySource == QSRC_QUAL_INSTEAD_RULE)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("conditional DO INSTEAD rules are not supported for data-modifying statements in "
|
|
"WITH")));
|
|
if (q->querySource == QSRC_NON_INSTEAD_RULE)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("DO ALSO rules are not supported for data-modifying statements in WITH")));
|
|
}
|
|
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg(
|
|
"multi-statement DO INSTEAD rules are not supported for data-modifying statements in WITH")));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the statement is an insert, update, or delete, adjust its targetlist
|
|
* as needed, and then fire INSERT/UPDATE/DELETE rules on it.
|
|
*
|
|
* SELECT rules are handled later when we have all the queries that should
|
|
* get executed. Also, utilities aren't rewritten at all (do we still
|
|
* need that check?)
|
|
*/
|
|
if (event != CMD_SELECT && event != CMD_UTILITY) {
|
|
int result_relation;
|
|
RangeTblEntry* rt_entry = NULL;
|
|
Relation rt_entry_relation;
|
|
List* locks = NIL;
|
|
bool hasGenCol = false;
|
|
List* product_queries = NIL;
|
|
List* attrnos = NIL;
|
|
int values_rte_index = 0;
|
|
bool defaults_remaining = false;
|
|
ListCell* resultRel = NULL;
|
|
bool rewriteView = false;
|
|
List* rewriteRelations = NIL;
|
|
|
|
result_relation = linitial2_int(parsetree->resultRelations);
|
|
|
|
if (result_relation == 0)
|
|
return rewritten;
|
|
|
|
rt_entry = rt_fetch(result_relation, parsetree->rtable);
|
|
AssertEreport(rt_entry->rtekind == RTE_RELATION, MOD_OPT, "");
|
|
|
|
/*
|
|
* We can use NoLock here since either the parser or
|
|
* AcquireRewriteLocks should have locked the rel already.
|
|
*/
|
|
rt_entry_relation = heap_open(rt_entry->relid, NoLock);
|
|
|
|
/*
|
|
* Rewrite the targetlist as needed for the command type.
|
|
*/
|
|
if (event == CMD_INSERT) {
|
|
RangeTblEntry* values_rte = NULL;
|
|
|
|
/*
|
|
* If it's an INSERT ... VALUES (...), (...), ... there will be a
|
|
* single RTE for the VALUES targetlists.
|
|
*/
|
|
if (list_length(parsetree->jointree->fromlist) == 1) {
|
|
RangeTblRef* rtr = (RangeTblRef*)linitial(parsetree->jointree->fromlist);
|
|
|
|
if (IsA(rtr, RangeTblRef)) {
|
|
RangeTblEntry* rte = rt_fetch(rtr->rtindex, parsetree->rtable);
|
|
|
|
if (rte->rtekind == RTE_VALUES) {
|
|
values_rte = rte;
|
|
values_rte_index = rtr->rtindex;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (values_rte != NULL) {
|
|
/* Process the main targetlist ... */
|
|
parsetree->targetList =
|
|
rewriteTargetListIU(parsetree->targetList, parsetree->commandType,
|
|
rt_entry_relation, result_relation, &attrnos,
|
|
&hasGenCol);
|
|
checkGenDefault(values_rte, rt_entry_relation, attrnos, hasGenCol);
|
|
/* ... and the VALUES expression lists */
|
|
if (!rewriteValuesRTE(parsetree, values_rte, rt_entry_relation, attrnos, false)) {
|
|
defaults_remaining = true;
|
|
}
|
|
} else {
|
|
/* Process just the main targetlist */
|
|
parsetree->targetList =
|
|
rewriteTargetListIU(parsetree->targetList, parsetree->commandType,
|
|
rt_entry_relation, result_relation, NULL,
|
|
&hasGenCol);
|
|
}
|
|
|
|
if (parsetree->upsertClause != NULL &&
|
|
parsetree->upsertClause->upsertAction == UPSERT_UPDATE) {
|
|
parsetree->upsertClause->updateTlist =
|
|
rewriteTargetListIU(parsetree->upsertClause->updateTlist, CMD_UPDATE,
|
|
rt_entry_relation, result_relation, NULL,
|
|
&hasGenCol);
|
|
}
|
|
} else if (event == CMD_UPDATE) {
|
|
if (list_length(parsetree->resultRelations) > 1) {
|
|
rewriteTargetListMutilUpdate(parsetree, parsetree->rtable, parsetree->resultRelations);
|
|
/* Also populate extraUpdatedCols (for generated columns) */
|
|
multiUpdateSetExtraUpdatedCols(parsetree);
|
|
} else {
|
|
parsetree->targetList =
|
|
rewriteTargetListIU(parsetree->targetList, parsetree->commandType,
|
|
rt_entry_relation, result_relation, NULL,
|
|
&hasGenCol);
|
|
/* Also populate extraUpdatedCols (for generated columns) */
|
|
setExtraUpdatedCols(rt_entry, rt_entry_relation->rd_att);
|
|
rewriteTargetListUD(parsetree, rt_entry, rt_entry_relation, result_relation);
|
|
}
|
|
} else if (event == CMD_DELETE) {
|
|
if (list_length(parsetree->resultRelations) > 1) {
|
|
rewriteTargetListMutilUD(parsetree, parsetree->rtable, parsetree->resultRelations);
|
|
} else {
|
|
rewriteTargetListUD(parsetree, rt_entry, rt_entry_relation, result_relation);
|
|
}
|
|
} else if (event == CMD_MERGE) {
|
|
/*
|
|
* Rewrite each action targetlist separately
|
|
*/
|
|
foreach (lc1, parsetree->mergeActionList) {
|
|
MergeAction* action = (MergeAction*)lfirst(lc1);
|
|
|
|
switch (action->commandType) {
|
|
case CMD_DELETE: /* Nothing to do here */
|
|
break;
|
|
case CMD_UPDATE:
|
|
action->targetList = rewriteTargetListMergeInto(action->targetList,
|
|
action->commandType,
|
|
rt_entry_relation,
|
|
result_relation,
|
|
NULL);
|
|
break;
|
|
case CMD_INSERT: {
|
|
action->targetList = rewriteTargetListMergeInto(action->targetList,
|
|
action->commandType,
|
|
rt_entry_relation,
|
|
result_relation,
|
|
NULL);
|
|
} break;
|
|
default: {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_UNEXPECTED_NODE_STATE),
|
|
errmsg("unrecognized commandType: %d", action->commandType)));
|
|
} break;
|
|
}
|
|
}
|
|
if (parsetree->upsertQuery != NULL) {
|
|
List* querytree_list = QueryRewrite(parsetree->upsertQuery);
|
|
if (list_length(querytree_list) != 1) {
|
|
ereport(ERROR, (errcode(ERRCODE_INVALID_STATUS ), errmsg("Unexpected status in upsert to merge.")));
|
|
}
|
|
parsetree->upsertQuery = (Query*)linitial(querytree_list);
|
|
}
|
|
/* Also populate extraUpdatedCols (for generated columns) */
|
|
setExtraUpdatedCols(rt_entry, rt_entry_relation->rd_att);
|
|
} else {
|
|
ereport(ERROR, (errcode(ERRCODE_INVALID_OPERATION), errmsg("unrecognized commandType: %d", (int)event)));
|
|
}
|
|
|
|
#ifdef PGXC
|
|
if (parsetree_list == NIL) {
|
|
#endif
|
|
/*
|
|
* Collect and apply the appropriate rules.
|
|
*/
|
|
locks = matchLocks(event, rt_entry_relation->rd_rules, result_relation, parsetree);
|
|
|
|
#ifdef ENABLE_MULTIPLE_NODES
|
|
if (IS_PGXC_COORDINATOR) {
|
|
product_queries =
|
|
fireRules(parsetree, result_relation, event, locks, &instead, &returning, &qual_product);
|
|
}
|
|
#else
|
|
product_queries =
|
|
fireRules(parsetree, result_relation, event, locks, &instead, &returning, &qual_product);
|
|
#endif
|
|
|
|
/*
|
|
* Relation has rules in multiple-relations modifying doesn't support,
|
|
* which is checked in CheckUDRelations.
|
|
*/
|
|
Assert(list_length(parsetree->resultRelations) <= 1 || product_queries == NULL);
|
|
|
|
/*
|
|
* If we have a VALUES RTE with any remaining untouched DEFAULT items,
|
|
* and we got any product queries, finalize the VALUES RTE for each
|
|
* product query (replacing the remaining DEFAULT items with NULLs).
|
|
* We don't do this for the original query, because we know that it
|
|
* must be an auto-insert on a view, and so should use the base
|
|
* relation's defaults for any remaining DEFAULT items.
|
|
*/
|
|
if (defaults_remaining && product_queries != NIL) {
|
|
ListCell* n = NULL;
|
|
|
|
/*
|
|
* Each product query has its own copy of the VALUES RTE at the
|
|
* same index in the rangetable, so we must finalize each one.
|
|
*/
|
|
foreach(n, product_queries) {
|
|
Query* pt = (Query*)lfirst(n);
|
|
RangeTblEntry* values_rte = rt_fetch(values_rte_index, pt->rtable);
|
|
|
|
rewriteValuesRTE(pt, values_rte, rt_entry_relation, attrnos, true);
|
|
}
|
|
}
|
|
|
|
if (product_queries != NIL) {
|
|
rewriteRelations = lappend_oid(rewriteRelations, RelationGetRelid(rt_entry_relation));
|
|
}
|
|
|
|
/* Element of resultRelations may be deleted under rewriteTargetView. */
|
|
List* tempResultRelations = (List*)copyObject(parsetree->resultRelations);
|
|
foreach (resultRel, tempResultRelations) {
|
|
result_relation = lfirst_int(resultRel);
|
|
|
|
heap_close(rt_entry_relation, NoLock);
|
|
|
|
rt_entry = rt_fetch(result_relation, parsetree->rtable);
|
|
rt_entry_relation = heap_open(rt_entry->relid, NoLock);
|
|
|
|
/*
|
|
* If there was no unqualified INSTEAD rule, and the target relation
|
|
* is a view without any INSTEAD OF triggers, see if the view can be
|
|
* automatically updated. If so, we perform the necessary query
|
|
* transformation here and add the resulting query to the
|
|
* product_queries list, so that it gets recursively rewritten if
|
|
* necessary.
|
|
*
|
|
* If the view cannot be automatically updated, we throw an error here
|
|
* which is OK since the query would fail at runtime anyway. Throwing
|
|
* the error here is preferable to the executor check since we have
|
|
* more detailed information available about why the view isn't
|
|
* updatable.
|
|
*/
|
|
if (!instead && rt_entry_relation->rd_rel->relkind == RELKIND_VIEW &&
|
|
!view_has_instead_trigger(rt_entry_relation, event)) {
|
|
/*
|
|
* If there were any qualified INSTEAD rules, don't allow the view
|
|
* to be automatically updated (an unqualified INSTEAD rule or
|
|
* INSTEAD OF trigger is required).
|
|
*
|
|
* The messages here should match execMain.c's CheckValidResultRel
|
|
* and in principle make those checks in executor unnecessary, but
|
|
* we keep them just in case.
|
|
*/
|
|
if (qual_product != NULL) {
|
|
switch (parsetree->commandType) {
|
|
case CMD_INSERT:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot insert into view \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errdetail("Views with conditional DO INSTEAD rules are not "
|
|
"automatically updatable."),
|
|
errhint("To enable inserting into the view, provide an INSTEAD OF INSERT trigger "
|
|
"or an unconditional ON INSERT DO INSTEAD rule.")));
|
|
break;
|
|
case CMD_UPDATE:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot update view \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errdetail("Views with conditional DO INSTEAD rules are not "
|
|
"automatically updatable."),
|
|
errhint("To enable updating the view, provide an INSTEAD OF UPDATE trigger "
|
|
"or an unconditional ON UPDATE DO INSTEAD rule.")));
|
|
break;
|
|
case CMD_DELETE:
|
|
ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("cannot delete from view \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation)),
|
|
errdetail("Views with conditional DO INSTEAD rules are not "
|
|
"automatically updatable."),
|
|
errhint("To enable deleting from the view, provide an INSTEAD OF DELETE trigger "
|
|
"or an unconditional ON DELETE DO INSTEAD rule.")));
|
|
break;
|
|
default:
|
|
ereport(ERROR, (errmsg("unrecognized CmdType: %d", (int)parsetree->commandType)));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attempt to rewrite the query to automatically update the view.
|
|
* This throws an error if the view can't be automatically
|
|
* updated.
|
|
*/
|
|
parsetree = rewriteTargetView(parsetree, rt_entry_relation, result_relation);
|
|
|
|
/*
|
|
* Set the "instead" flag, as if there had been an unqualified
|
|
* INSTEAD, to prevent the original query from being included a
|
|
* second time below. The transformation will have rewritten any
|
|
* RETURNING list, so we can also set "returning" to forestall
|
|
* throwing an error below.
|
|
*/
|
|
instead = true;
|
|
returning = true;
|
|
rewriteView = true;
|
|
|
|
/*
|
|
* If there were any unqualified INSTEAD rules, rewriteRelations
|
|
* may contain duplicated oid. But it is ok cause we just use the
|
|
* list to check if recursive.
|
|
*/
|
|
rewriteRelations = lappend_oid(rewriteRelations, RelationGetRelid(rt_entry_relation));
|
|
}
|
|
}
|
|
pfree(tempResultRelations);
|
|
|
|
/*
|
|
* At this point product_queries contains any DO ALSO rule actions.
|
|
* Add the rewritten query before or after those. This must match
|
|
* the handling the original query would have gotten below, if
|
|
* we allowed it to be included again.
|
|
*/
|
|
if (rewriteView) {
|
|
if (parsetree->commandType == CMD_INSERT)
|
|
product_queries = lcons(parsetree, product_queries);
|
|
else
|
|
product_queries = lappend(product_queries, parsetree);
|
|
}
|
|
|
|
/*
|
|
* If we got any product queries, recursively rewrite them --- but
|
|
* first check for recursion!
|
|
*/
|
|
if (product_queries != NIL) {
|
|
ListCell* n = NULL;
|
|
rewrite_event* rev = NULL;
|
|
int i;
|
|
|
|
foreach (n, rewrite_events) {
|
|
rev = (rewrite_event*)lfirst(n);
|
|
if (list_member_oid(rewriteRelations, rev->relation) && rev->event == event)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
|
errmsg("infinite recursion detected in rules for relation \"%s\"",
|
|
RelationGetRelationName(RelationIdGetRelation(rev->relation)))));
|
|
}
|
|
|
|
foreach (n, rewriteRelations) {
|
|
rev = (rewrite_event*)palloc(sizeof(rewrite_event));
|
|
rev->relation = lfirst_oid(n);
|
|
rev->event = event;
|
|
rewrite_events = lcons(rev, rewrite_events);
|
|
}
|
|
|
|
foreach (n, product_queries) {
|
|
Query* pt = (Query*)lfirst(n);
|
|
List* newstuff = NULL;
|
|
|
|
newstuff = RewriteQuery(pt, rewrite_events);
|
|
rewritten = list_concat(rewritten, newstuff);
|
|
}
|
|
|
|
for (i = 0; i < list_length(rewriteRelations); i++) {
|
|
rewrite_events = list_delete_first(rewrite_events);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there is an INSTEAD, and the original query has a RETURNING, we
|
|
* have to have found a RETURNING in the rule(s), else fail. (Because
|
|
* DefineQueryRewrite only allows RETURNING in unconditional INSTEAD
|
|
* rules, there's no need to worry whether the substituted RETURNING
|
|
* will actually be executed --- it must be.)
|
|
*
|
|
* Ignore for multiple modifying cause returning clause is not supported.
|
|
*/
|
|
if ((instead || qual_product != NULL) && parsetree->returningList && !returning) {
|
|
ereport_for_each_cmdtype(event, rt_entry_relation);
|
|
}
|
|
|
|
heap_close(rt_entry_relation, NoLock);
|
|
#ifdef PGXC
|
|
} else {
|
|
foreach (pt_cell, parsetree_list) {
|
|
Query* query = NULL;
|
|
|
|
query = (Query*)lfirst(pt_cell);
|
|
|
|
/*
|
|
* Collect and apply the appropriate rules.
|
|
*/
|
|
locks = matchLocks(event, rt_entry_relation->rd_rules, result_relation, query);
|
|
|
|
if (locks != NIL) {
|
|
List* product_queries = NIL;
|
|
|
|
if (IS_PGXC_COORDINATOR)
|
|
product_queries =
|
|
fireRules(query, result_relation, event, locks, &instead, &returning, &qual_product);
|
|
|
|
qual_product_list = lappend(qual_product_list, qual_product);
|
|
|
|
/*
|
|
* If we got any product queries, recursively rewrite them --- but
|
|
* first check for recursion!
|
|
*/
|
|
if (product_queries != NIL) {
|
|
ListCell* n = NULL;
|
|
rewrite_event* rev = NULL;
|
|
|
|
foreach (n, rewrite_events) {
|
|
rev = (rewrite_event*)lfirst(n);
|
|
if (rev->relation == RelationGetRelid(rt_entry_relation) && rev->event == event)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
|
|
errmsg("infinite recursion detected in rules for relation \"%s\"",
|
|
RelationGetRelationName(rt_entry_relation))));
|
|
}
|
|
|
|
rev = (rewrite_event*)palloc(sizeof(rewrite_event));
|
|
rev->relation = RelationGetRelid(rt_entry_relation);
|
|
rev->event = event;
|
|
rewrite_events = lcons(rev, rewrite_events);
|
|
|
|
foreach (n, product_queries) {
|
|
Query* pt = (Query*)lfirst(n);
|
|
List* newstuff = NIL;
|
|
|
|
newstuff = RewriteQuery(pt, rewrite_events);
|
|
rewritten = list_concat(rewritten, newstuff);
|
|
}
|
|
|
|
rewrite_events = list_delete_first(rewrite_events);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there is an INSTEAD, and the original query has a RETURNING, we
|
|
* have to have found a RETURNING in the rule(s), else fail. (Because
|
|
* DefineQueryRewrite only allows RETURNING in unconditional INSTEAD
|
|
* rules, there's no need to worry whether the substituted RETURNING
|
|
* will actually be executed --- it must be.)
|
|
*/
|
|
if ((instead || qual_product != NULL) && query->returningList && !returning) {
|
|
ereport_for_each_cmdtype(event, rt_entry_relation);
|
|
}
|
|
}
|
|
|
|
heap_close(rt_entry_relation, NoLock);
|
|
}
|
|
}
|
|
|
|
if (parsetree_list == NIL) {
|
|
#endif
|
|
/*
|
|
* For INSERTs, the original query is done first; for UPDATE/DELETE, it is
|
|
* done last. This is needed because update and delete rule actions might
|
|
* not do anything if they are invoked after the update or delete is
|
|
* performed. The command counter increment between the query executions
|
|
* makes the deleted (and maybe the updated) tuples disappear so the scans
|
|
* for them in the rule actions cannot find them.
|
|
*
|
|
* If we found any unqualified INSTEAD, the original query is not done at
|
|
* all, in any form. Otherwise, we add the modified form if qualified
|
|
* INSTEADs were found, else the unmodified form.
|
|
*/
|
|
if (!instead) {
|
|
if (parsetree->commandType == CMD_INSERT) {
|
|
if (qual_product != NULL)
|
|
rewritten = lcons(qual_product, rewritten);
|
|
else
|
|
rewritten = lcons(parsetree, rewritten);
|
|
} else {
|
|
if (qual_product != NULL)
|
|
rewritten = lappend(rewritten, qual_product);
|
|
else
|
|
rewritten = lappend(rewritten, parsetree);
|
|
}
|
|
}
|
|
#ifdef PGXC
|
|
} else {
|
|
int query_no = 0;
|
|
|
|
foreach (pt_cell, parsetree_list) {
|
|
|
|
Query* query = NULL;
|
|
Query* qual = NULL;
|
|
|
|
query = (Query*)lfirst(pt_cell);
|
|
if (instead == false) {
|
|
if (qual_product_list != NIL)
|
|
qual = (Query*)list_nth(qual_product_list, query_no);
|
|
|
|
if (query->commandType == CMD_INSERT) {
|
|
if (qual != NULL)
|
|
rewritten = lcons(qual, rewritten);
|
|
else
|
|
rewritten = lcons(query, rewritten);
|
|
} else {
|
|
if (qual != NULL)
|
|
rewritten = lappend(rewritten, qual);
|
|
else
|
|
rewritten = lappend(rewritten, query);
|
|
}
|
|
}
|
|
query_no++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If the original query has a CTE list, and we generated more than one
|
|
* non-utility result query, we have to fail because we'll have copied the
|
|
* CTE list into each result query. That would break the expectation of
|
|
* single evaluation of CTEs. This could possibly be fixed by
|
|
* restructuring so that a CTE list can be shared across multiple Query
|
|
* and PlannableStatement nodes.
|
|
*/
|
|
if (parsetree->cteList != NIL) {
|
|
int qcount = 0;
|
|
|
|
foreach (lc1, rewritten) {
|
|
Query* q = (Query*)lfirst(lc1);
|
|
|
|
if (q->commandType != CMD_UTILITY)
|
|
qcount++;
|
|
}
|
|
if (qcount > 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("WITH cannot be used in a query that is rewritten by rules into multiple queries")));
|
|
}
|
|
|
|
if (parsetree->isReplace) {
|
|
foreach (lc1, rewritten) {
|
|
Query* q = (Query*)lfirst(lc1);
|
|
|
|
q->isReplace = parsetree->isReplace;
|
|
}
|
|
}
|
|
|
|
return rewritten;
|
|
}
|
|
|
|
/*
|
|
* QueryRewrite -
|
|
* Primary entry point to the query rewriter.
|
|
* Rewrite one query via query rewrite system, possibly returning 0
|
|
* or many queries.
|
|
*
|
|
* NOTE: the parsetree must either have come straight from the parser,
|
|
* or have been scanned by AcquireRewriteLocks to acquire suitable locks.
|
|
*/
|
|
List* QueryRewrite(Query* parsetree)
|
|
{
|
|
uint64 input_query_id = parsetree->queryId;
|
|
List* querylist = NIL;
|
|
List* results = NIL;
|
|
ListCell* l = NULL;
|
|
CmdType origCmdType;
|
|
bool foundOriginalQuery = false;
|
|
Query* lastInstead = NULL;
|
|
|
|
/*
|
|
* This function is only applied to top-level original queries
|
|
*/
|
|
AssertEreport(parsetree->querySource == QSRC_ORIGINAL, MOD_OPT, "");
|
|
AssertEreport(parsetree->canSetTag, MOD_OPT, "");
|
|
/*
|
|
* Step 1
|
|
*
|
|
* Apply all non-SELECT rules possibly getting 0 or many queries
|
|
*/
|
|
querylist = RewriteQuery(parsetree, NIL);
|
|
|
|
/*
|
|
* Step 2
|
|
*
|
|
* Apply all the RIR rules on each query
|
|
*
|
|
* This is also a handy place to mark each query with the original queryId
|
|
*/
|
|
results = NIL;
|
|
foreach (l, querylist) {
|
|
Query* query = (Query*)lfirst(l);
|
|
|
|
query = fireRIRrules(query, NIL, false);
|
|
|
|
query->queryId = input_query_id;
|
|
|
|
results = lappend(results, query);
|
|
}
|
|
|
|
/*
|
|
* Step 3
|
|
*
|
|
* Determine which, if any, of the resulting queries is supposed to set
|
|
* the command-result tag; and update the canSetTag fields accordingly.
|
|
*
|
|
* If the original query is still in the list, it sets the command tag.
|
|
* Otherwise, the last INSTEAD query of the same kind as the original is
|
|
* allowed to set the tag. (Note these rules can leave us with no query
|
|
* setting the tag. The tcop code has to cope with this by setting up a
|
|
* default tag based on the original un-rewritten query.)
|
|
*
|
|
* The Asserts verify that at most one query in the result list is marked
|
|
* canSetTag. If we aren't checking asserts, we can fall out of the loop
|
|
* as soon as we find the original query.
|
|
*/
|
|
origCmdType = parsetree->commandType;
|
|
foundOriginalQuery = false;
|
|
lastInstead = NULL;
|
|
|
|
foreach (l, results) {
|
|
Query* query = (Query*)lfirst(l);
|
|
|
|
if (query->querySource == QSRC_ORIGINAL) {
|
|
AssertEreport(query->canSetTag, MOD_OPT, "");
|
|
#ifndef PGXC
|
|
AssertEreport(!foundOriginalQuery, MOD_OPT, "");
|
|
#endif
|
|
foundOriginalQuery = true;
|
|
#ifndef USE_ASSERT_CHECKING
|
|
break;
|
|
#endif
|
|
} else {
|
|
AssertEreport(!query->canSetTag, MOD_OPT, "");
|
|
if (query->commandType == origCmdType &&
|
|
(query->querySource == QSRC_INSTEAD_RULE || query->querySource == QSRC_QUAL_INSTEAD_RULE))
|
|
lastInstead = query;
|
|
}
|
|
}
|
|
|
|
if (!foundOriginalQuery && lastInstead != NULL)
|
|
lastInstead->canSetTag = true;
|
|
|
|
if (CONVERT_STRING_DIGIT_TO_NUMERIC) {
|
|
foreach (l, results) {
|
|
(void)PreprocessOperator((Node*)lfirst(l), NULL);
|
|
}
|
|
}
|
|
|
|
return results;
|
|
}
|
|
|
|
Const* processResToConst(char* value, Oid atttypid, Oid collid)
|
|
{
|
|
Const *con = NULL;
|
|
uint len = strlen(value);
|
|
char *str_value = (char *)palloc(len + 1);
|
|
errno_t rc = strncpy_s(str_value, len + 1, value, len + 1);
|
|
securec_check(rc, "\0", "\0");
|
|
str_value[len] = '\0';
|
|
Datum str_datum = CStringGetDatum(str_value);
|
|
|
|
/* convert value to const expression. */
|
|
if (atttypid == BOOLOID) {
|
|
if (strcmp(str_value, "t") == 0) {
|
|
con = makeConst(BOOLOID, -1, InvalidOid, sizeof(bool), BoolGetDatum(true), false, true);
|
|
} else {
|
|
con = makeConst(BOOLOID, -1, InvalidOid, sizeof(bool), BoolGetDatum(false), false, true);
|
|
}
|
|
} else {
|
|
con = makeConst(UNKNOWNOID, -1, collid, -2, str_datum, false, false);
|
|
}
|
|
return con;
|
|
}
|
|
|
|
#ifdef PGXC
|
|
|
|
char* GetCreateViewStmt(Query* parsetree, CreateTableAsStmt* stmt)
|
|
{
|
|
/* Obtain the target list of new table */
|
|
AssertEreport(IsA(stmt->query, Query), MOD_OPT, "");
|
|
|
|
ViewStmt* view_stmt = makeNode(ViewStmt);
|
|
view_stmt->view = stmt->into->rel;
|
|
view_stmt->query = stmt->query;
|
|
view_stmt->view->relpersistence = RELPERSISTENCE_PERMANENT;
|
|
view_stmt->aliases = stmt->into->colNames;
|
|
view_stmt->options = stmt->into->options;
|
|
view_stmt->relkind = OBJECT_MATVIEW;
|
|
view_stmt->ivm = stmt->into->ivm;
|
|
|
|
#ifdef ENABLE_MULTIPLE_NODES
|
|
PGXCSubCluster* subcluster = NULL;
|
|
|
|
if (stmt->into->subcluster == NULL && view_stmt->ivm) {
|
|
char *group_name = ng_get_group_group_name(stmt->groupid);
|
|
|
|
subcluster = makeNode(PGXCSubCluster);
|
|
subcluster->clustertype = SUBCLUSTER_GROUP;
|
|
subcluster->members = list_make1(makeString(group_name));
|
|
|
|
view_stmt->subcluster = subcluster;
|
|
stmt->into->subcluster = subcluster;
|
|
} else {
|
|
view_stmt->subcluster = stmt->into->subcluster;
|
|
}
|
|
#endif
|
|
|
|
parsetree->commandType = CMD_UTILITY;
|
|
parsetree->utilityStmt = (Node*)view_stmt;
|
|
|
|
StringInfo cquery = makeStringInfo();
|
|
|
|
deparse_query(parsetree, cquery, NIL, false, false);
|
|
|
|
return cquery->data;
|
|
}
|
|
|
|
static bool findAttrByName(const char* attributeName, List* tableElts, int maxlen)
|
|
{
|
|
ListCell* lc = NULL;
|
|
int i = 0;
|
|
foreach (lc, tableElts) {
|
|
if (i >= maxlen) {
|
|
return false;
|
|
}
|
|
Node* node = (Node*)lfirst(lc);
|
|
if (IsA(node, ColumnDef)) {
|
|
ColumnDef* def = (ColumnDef*)node;
|
|
if (pg_strcasecmp(attributeName, def->colname) == 0)
|
|
return true;
|
|
}
|
|
++i;
|
|
}
|
|
return false;
|
|
}
|
|
/*
|
|
* for create table as in B foramt, add type's oid and typemod in tableElts
|
|
*/
|
|
static void addInitAttrType(List* tableElts)
|
|
{
|
|
ListCell* lc = NULL;
|
|
|
|
foreach (lc, tableElts) {
|
|
Node* node = (Node*)lfirst(lc);
|
|
if (IsA(node, ColumnDef)) {
|
|
ColumnDef* def = (ColumnDef*)node;
|
|
typenameTypeIdAndMod(NULL, def->typname, &def->typname->typeOid, &def->typname->typemod);
|
|
}
|
|
}
|
|
}
|
|
|
|
char* GetCreateTableStmt(Query* parsetree, CreateTableAsStmt* stmt)
|
|
{
|
|
/* Start building a CreateStmt for creating the target table */
|
|
CreateStmt* create_stmt = makeNode(CreateStmt);
|
|
create_stmt->relation = stmt->into->rel;
|
|
create_stmt->charset = PG_INVALID_ENCODING;
|
|
IntoClause* into = stmt->into;
|
|
List* tableElts = NIL;
|
|
|
|
if (u_sess->attr.attr_sql.sql_compatibility == B_FORMAT) {
|
|
tableElts = stmt->into->tableElts;
|
|
addInitAttrType(tableElts);
|
|
}
|
|
int initlen = list_length(tableElts);
|
|
|
|
/* Obtain the target list of new table */
|
|
AssertEreport(IsA(stmt->query, Query), MOD_OPT, "");
|
|
Query* cparsetree = (Query*)stmt->query;
|
|
List* tlist = cparsetree->targetList;
|
|
|
|
/*
|
|
* Based on the targetList, populate the column information for the target
|
|
* table. If a column name list was specified in CREATE TABLE AS, override
|
|
* the column names derived from the query. (Too few column names are OK, too
|
|
* many are not.).
|
|
*/
|
|
ListCell* col = NULL;
|
|
ListCell* lc = list_head(into->colNames);
|
|
foreach (col, tlist) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(col);
|
|
ColumnDef* coldef = NULL;
|
|
ClientLogicColumnRef *coldef_enc = NULL;
|
|
TypeName* tpname = NULL;
|
|
|
|
if (IsA(tle->expr, Var)) {
|
|
Var* ColTypProperty = (Var*)(tle->expr);
|
|
/*
|
|
* It's possible that the column is of a collatable type but the
|
|
* collation could not be resolved, so double-check. (We must check
|
|
* this here because DefineRelation would adopt the type's default
|
|
* collation rather than complaining.)
|
|
*/
|
|
if (!OidIsValid(ColTypProperty->varcollid) && type_is_collatable(ColTypProperty->vartype))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INDETERMINATE_COLLATION),
|
|
errmsg("no collation was derived for column \"%s\" with collatable type %s",
|
|
tle->resname,
|
|
format_type_be(ColTypProperty->vartype)),
|
|
errhint("Use the COLLATE clause to set the collation explicitly.")));
|
|
}
|
|
|
|
/* Ignore junk columns from the targetlist */
|
|
if (tle->resjunk)
|
|
continue;
|
|
|
|
if (u_sess->attr.attr_sql.sql_compatibility == B_FORMAT && findAttrByName(tle->resname, tableElts, initlen)) {
|
|
continue;
|
|
}
|
|
|
|
coldef = makeNode(ColumnDef);
|
|
tpname = makeNode(TypeName);
|
|
|
|
/* Take the column name specified if any */
|
|
if (lc != NULL) {
|
|
coldef->colname = strVal(lfirst(lc));
|
|
lc = lnext(lc);
|
|
} else
|
|
coldef->colname = pstrdup(tle->resname);
|
|
|
|
coldef->inhcount = 0;
|
|
coldef->is_local = true;
|
|
coldef->is_not_null = false;
|
|
/* The best way to set cmprs_mode is copied from the source column defination.
|
|
* but the cost is heavy, so make it the default method without forbiting compressing.
|
|
* refer to ExecCreateTableAs() --> CreateIntoRelDestReceiver() --> intorel_startup()
|
|
*/
|
|
coldef->cmprs_mode = ATT_CMPR_UNDEFINED;
|
|
coldef->raw_default = NULL;
|
|
coldef->cooked_default = NULL;
|
|
coldef->update_default = NULL;
|
|
coldef->constraints = NIL;
|
|
coldef->collOid = exprCollation((Node*)tle->expr);
|
|
|
|
/*
|
|
* Set typeOid and typemod. The name of the type is derived while
|
|
* generating query
|
|
*/
|
|
tpname->typeOid = exprType((Node*)tle->expr);
|
|
tpname->typemod = exprTypmod((Node*)tle->expr);
|
|
tpname->charset = exprCharset((Node*)tle->expr);
|
|
|
|
/*
|
|
* If the column of source relation is encrypted
|
|
* instead of copying its typeOid directly
|
|
* we should get its original defination from the catalog
|
|
*/
|
|
if (is_enc_type(tpname->typeOid)) {
|
|
coldef_enc = get_column_enc_def(tle->resorigtbl, tle->resname);
|
|
if (coldef_enc != NULL) { /* should never be NULL */
|
|
coldef_enc->dest_typname = makeTypeNameFromOid(tpname->typeOid, -1);
|
|
|
|
tpname->typeOid = coldef_enc->orig_typname->typeOid;
|
|
tpname->typemod = coldef_enc->orig_typname->typemod;
|
|
}
|
|
|
|
coldef->clientLogicColumnRef = coldef_enc;
|
|
}
|
|
|
|
coldef->typname = tpname;
|
|
|
|
tableElts = lappend(tableElts, coldef);
|
|
}
|
|
|
|
if (lc != NULL)
|
|
ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("%s specifies too many column names",
|
|
stmt->relkind == OBJECT_MATVIEW ? "CREATE MATERIALIZED VIEW" : "CREATE TABLE AS")));
|
|
|
|
/*
|
|
* Set column information and the distribution mechanism (which will be
|
|
* NULL for SELECT INTO and the default mechanism will be picked)
|
|
*/
|
|
create_stmt->tableElts = tableElts;
|
|
create_stmt->distributeby = stmt->into->distributeby;
|
|
create_stmt->subcluster = stmt->into->subcluster;
|
|
|
|
create_stmt->tablespacename = stmt->into->tableSpaceName;
|
|
create_stmt->oncommit = stmt->into->onCommit;
|
|
create_stmt->row_compress = stmt->into->row_compress;
|
|
create_stmt->options = stmt->into->options;
|
|
create_stmt->ivm = stmt->into->ivm;
|
|
create_stmt->relkind = stmt->relkind == OBJECT_MATVIEW ? RELKIND_MATVIEW : RELKIND_RELATION;
|
|
if (u_sess->attr.attr_sql.sql_compatibility == B_FORMAT) {
|
|
create_stmt->autoIncStart = stmt->into->autoIncStart;
|
|
}
|
|
/*
|
|
* Check consistency of arguments
|
|
*/
|
|
if (create_stmt->oncommit != ONCOMMIT_NOOP &&
|
|
create_stmt->relation->relpersistence != RELPERSISTENCE_TEMP &&
|
|
create_stmt->relation->relpersistence != RELPERSISTENCE_GLOBAL_TEMP) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_TABLE_DEFINITION), errmsg("ON COMMIT can only be used on temporary tables")));
|
|
}
|
|
|
|
#ifdef ENABLE_MULTIPLE_NODES
|
|
if (create_stmt->subcluster == NULL && create_stmt->relkind == RELKIND_MATVIEW && create_stmt->ivm) {
|
|
PGXCSubCluster* subcluster = NULL;
|
|
char *group_name = ng_get_group_group_name(stmt->groupid);
|
|
|
|
subcluster = makeNode(PGXCSubCluster);
|
|
subcluster->clustertype = SUBCLUSTER_GROUP;
|
|
subcluster->members = list_make1(makeString(group_name));
|
|
create_stmt->subcluster = subcluster;
|
|
stmt->into->subcluster = subcluster;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Now build a utility statement in order to run the CREATE TABLE DDL on
|
|
* the local and remote nodes. We keep others fields as it is since they
|
|
* are ignored anyways by deparse_query.
|
|
*/
|
|
parsetree->commandType = CMD_UTILITY;
|
|
parsetree->utilityStmt = (Node*)create_stmt;
|
|
|
|
StringInfo cquery = makeStringInfo();
|
|
|
|
deparse_query(parsetree, cquery, NIL, false, false);
|
|
|
|
return cquery->data;
|
|
}
|
|
|
|
static bool selectNeedRecovery(Query* query)
|
|
{
|
|
if (!query->hasRecursive || query->sql_statement == NULL) {
|
|
return false;
|
|
}
|
|
return strcasestr(query->sql_statement, "CONNECT") != NULL;
|
|
}
|
|
|
|
/*
|
|
* @Description: copy(shallow) hints which needs to be displayed in top.
|
|
* (e.g. pull "select HINT..." to "Insert HINT INTO XXX SELECT HINT..." )
|
|
* @in src: hint state.
|
|
* @out dest: hint state.
|
|
*/
|
|
static void _copy_top_HintState(HintState *dest, HintState *src)
|
|
{
|
|
if (dest == NULL || src == NULL) {
|
|
return;
|
|
}
|
|
|
|
dest->stream_hint = src->stream_hint;
|
|
dest->gather_hint = src->gather_hint;
|
|
dest->cache_plan_hint = src->cache_plan_hint;
|
|
dest->set_hint = src->set_hint;
|
|
dest->no_gpc_hint = src->no_gpc_hint;
|
|
dest->multi_node_hint = src->multi_node_hint;
|
|
dest->skew_hint = src->skew_hint;
|
|
dest->predpush_hint = src->predpush_hint;
|
|
dest->predpush_same_level_hint = src->predpush_same_level_hint;
|
|
dest->rewrite_hint = src->rewrite_hint;
|
|
dest->no_expand_hint = src->no_expand_hint;
|
|
}
|
|
|
|
char* GetInsertIntoStmt(CreateTableAsStmt* stmt, bool hasNewColumn)
|
|
|
|
{
|
|
/* Get the SELECT query string */
|
|
/*
|
|
* If target table name is the same as an existed one and schema name is NULL, INSERT INTO
|
|
* statement may not find the right target table. Therefore we should get the schema name
|
|
* first so that the INSERT INTO statement can insert into the target table.
|
|
*/
|
|
RangeVar *relation = stmt->into->rel;
|
|
if (relation->schemaname == NULL && relation->relpersistence != RELPERSISTENCE_TEMP) {
|
|
Oid namespaceid = RangeVarGetAndCheckCreationNamespace(relation, NoLock, NULL, RELKIND_RELATION);
|
|
relation->schemaname = get_namespace_name(namespaceid);
|
|
}
|
|
|
|
StringInfo cquery = makeStringInfo();
|
|
deparse_query((Query*)stmt->query, cquery, NIL, false, false, stmt->parserSetupArg);
|
|
char* selectstr = pstrdup(cquery->data);
|
|
|
|
/*
|
|
* Check if we should recover from the rewriting performed on the select part,
|
|
* e.g. for START WITH cases we need to do this after rewriting
|
|
*/
|
|
Query* select_query = (Query*)stmt->query;
|
|
if (selectNeedRecovery(select_query)) {
|
|
selectstr = pstrdup(select_query->sql_statement);
|
|
}
|
|
|
|
/* Now, finally build the INSERT INTO statement */
|
|
initStringInfo(cquery);
|
|
|
|
appendStringInfo(cquery, "INSERT ");
|
|
|
|
HintState *top_hintState = HintStateCreate();
|
|
_copy_top_HintState(top_hintState, ((Query *)stmt->query)->hintState);
|
|
get_hint_string(top_hintState, cquery);
|
|
if (top_hintState)
|
|
pfree((void *)top_hintState);
|
|
if (relation->schemaname)
|
|
appendStringInfo(
|
|
cquery, " INTO %s.%s", quote_identifier(relation->schemaname), quote_identifier(relation->relname));
|
|
else
|
|
appendStringInfo(cquery, " INTO %s", quote_identifier(relation->relname));
|
|
|
|
/* if has new column and have data to insert */
|
|
if (u_sess->attr.attr_sql.sql_compatibility == B_FORMAT && hasNewColumn && !stmt->into->skipData) {
|
|
appendStringInfoString(cquery, " (");
|
|
ListCell* lc = NULL;
|
|
const char* delimiter = "";
|
|
foreach (lc, select_query->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(lc);
|
|
/* ignore junk column*/
|
|
if (tle->resjunk)
|
|
continue;
|
|
appendStringInfoString(cquery, delimiter);
|
|
delimiter = ", ";
|
|
appendStringInfo(cquery, "%s", quote_identifier(tle->resname));
|
|
}
|
|
appendStringInfoString(cquery, ")");
|
|
}
|
|
|
|
/*
|
|
* If the original sql contains "WITH NO DATA", just create
|
|
* the table without inserting any data.
|
|
*/
|
|
if (stmt->into->skipData)
|
|
appendStringInfoString(cquery, " select null where false");
|
|
else
|
|
appendStringInfo(cquery, " %s", selectstr);
|
|
|
|
/* If there is a new column, there may be a uniqueness conflict */
|
|
if (u_sess->attr.attr_sql.sql_compatibility == B_FORMAT && hasNewColumn && !stmt->into->skipData) {
|
|
switch (stmt->into->onduplicate) {
|
|
case DUPLICATE_ERROR:
|
|
break;
|
|
case DUPLICATE_IGNORE:
|
|
appendStringInfoString(cquery, " ON DUPLICATE KEY UPDATE NOTHING");
|
|
break;
|
|
case DUPLICATE_REPLACE: {
|
|
appendStringInfoString(cquery, " ON DUPLICATE KEY UPDATE ");
|
|
ListCell* lc = NULL;
|
|
const char* delimiter = "";
|
|
foreach (lc, select_query->targetList) {
|
|
TargetEntry* tle = (TargetEntry*)lfirst(lc);
|
|
/* ignore junk column*/
|
|
if (tle->resjunk)
|
|
continue;
|
|
appendStringInfoString(cquery, delimiter);
|
|
delimiter = ", ";
|
|
appendStringInfo(cquery, "%s = VALUES(%s)", quote_identifier(tle->resname), quote_identifier(tle->resname));
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return cquery->data;
|
|
}
|
|
|
|
List *query_rewrite_multiset_stmt(Query *query)
|
|
{
|
|
List* querytree_list = NIL;
|
|
VariableMultiSetStmt* muti_stmt = (VariableMultiSetStmt*)query->utilityStmt;
|
|
List* stmts = muti_stmt->args;
|
|
ListCell* cell = NULL;
|
|
VariableSetStmt *set_stmt;
|
|
|
|
foreach(cell, stmts) {
|
|
Node* stmt = (Node*)lfirst(cell);
|
|
|
|
if (nodeTag(stmt) == T_AlterSystemStmt) {
|
|
AlterSystemStmt* alter_sys_stmt = (AlterSystemStmt *)stmt;
|
|
set_stmt = alter_sys_stmt->setstmt;
|
|
} else {
|
|
set_stmt = (VariableSetStmt*)stmt;
|
|
}
|
|
|
|
if (list_length(set_stmt->args) > 1) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("set %s takes only one argument", set_stmt->name)));
|
|
}
|
|
|
|
if(set_stmt->kind == VAR_SET_VALUE) {
|
|
List *resultlist = NIL;
|
|
ListCell *l = NULL;
|
|
|
|
foreach(l, set_stmt->args) {
|
|
Node* expr = (Node*)lfirst(l);
|
|
Node* node = NULL;
|
|
|
|
if(IsA(expr, A_Const)) {
|
|
node = expr;
|
|
} else {
|
|
node = eval_const_expression_value(NULL, expr, NULL);
|
|
|
|
if(nodeTag(node) != T_Const) {
|
|
node = QueryRewriteNonConstant(expr);
|
|
}
|
|
node = transferConstToAconst(node);
|
|
}
|
|
resultlist = lappend(resultlist, (A_Const*)node);
|
|
}
|
|
list_free(set_stmt->args);
|
|
set_stmt->args = resultlist;
|
|
}
|
|
}
|
|
|
|
querytree_list = list_make1(query);
|
|
return querytree_list;
|
|
}
|
|
|
|
List *query_rewrite_set_stmt(Query *query)
|
|
{
|
|
List* querytree_list = NIL;
|
|
VariableSetStmt *stmt = (VariableSetStmt *)query->utilityStmt;
|
|
|
|
if(DB_IS_CMPT(B_FORMAT) && stmt->kind == VAR_SET_VALUE &&
|
|
(u_sess->attr.attr_common.enable_set_variable_b_format || ENABLE_SET_VARIABLES)) {
|
|
List *resultlist = NIL;
|
|
ListCell *l = NULL;
|
|
|
|
foreach(l, stmt->args) {
|
|
Node* expr = (Node*)lfirst(l);
|
|
Node* node = NULL;
|
|
if(nodeTag(expr) == T_A_Const) {
|
|
node = expr;
|
|
} else {
|
|
node = eval_const_expression_value(NULL, expr, NULL);
|
|
|
|
if(nodeTag(node) != T_Const) {
|
|
node = QueryRewriteNonConstant(expr);
|
|
}
|
|
node = transferConstToAconst(node);
|
|
}
|
|
resultlist = lappend(resultlist, (A_Const*)node);
|
|
}
|
|
list_free(stmt->args);
|
|
stmt->args = resultlist;
|
|
}
|
|
|
|
querytree_list = list_make1(query);
|
|
return querytree_list;
|
|
}
|
|
|
|
List *QueryRewriteRefresh(Query *parse_tree)
|
|
{
|
|
RefreshMatViewStmt* stmt = NULL;
|
|
RewriteRule *rule = NULL;
|
|
Oid matviewOid;
|
|
Relation matviewRel;
|
|
List *actions = NIL;
|
|
Query *dataQuery;
|
|
List* raw_parsetree_list = NIL;
|
|
|
|
if (parse_tree->commandType != CMD_UTILITY || !IsA(parse_tree->utilityStmt, RefreshMatViewStmt)) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE),
|
|
errmsg("Unexpected commandType or intoClause is not set properly")));
|
|
}
|
|
|
|
/* Get the target table */
|
|
stmt = (RefreshMatViewStmt *)parse_tree->utilityStmt;
|
|
RangeVar *relation = stmt->relation;
|
|
|
|
if (relation->schemaname == NULL && relation->relpersistence != RELPERSISTENCE_TEMP) {
|
|
Oid namespaceid = RangeVarGetAndCheckCreationNamespace(relation, NoLock, NULL, RELKIND_MATVIEW);
|
|
relation->schemaname = get_namespace_name(namespaceid);
|
|
}
|
|
|
|
StringInfo tquery = makeStringInfo();
|
|
|
|
/* 1. TRUNCATE mv */
|
|
initStringInfo(tquery);
|
|
|
|
if (IS_PGXC_COORDINATOR) {
|
|
appendStringInfo(tquery, "REFRESH MATERIALIZED VIEW ");
|
|
} else {
|
|
appendStringInfo(tquery, "TRUNCATE TABLE ");
|
|
}
|
|
|
|
if (relation->schemaname)
|
|
appendStringInfo(
|
|
tquery, "%s.%s", quote_identifier(relation->schemaname), quote_identifier(relation->relname));
|
|
else
|
|
appendStringInfo(tquery, "%s", quote_identifier(relation->relname));
|
|
|
|
char *refresh_sql = tquery->data;
|
|
if (IS_PGXC_COORDINATOR) {
|
|
ExecUtilityStmtOnNodes(refresh_sql, NULL, false, false, EXEC_ON_DATANODES, false);
|
|
} else {
|
|
raw_parsetree_list = pg_parse_query(refresh_sql);
|
|
return pg_analyze_and_rewrite((Node*)linitial(raw_parsetree_list), refresh_sql, NULL, 0);
|
|
}
|
|
|
|
/* 2. Insert Into .... Select statement */
|
|
StringInfo cquery = makeStringInfo();
|
|
|
|
/*
|
|
* Get a lock until end of transaction.
|
|
*/
|
|
matviewOid = RangeVarGetRelidExtended(stmt->relation,
|
|
AccessExclusiveLock, false, false, false, false,
|
|
RangeVarCallbackOwnsMatView, NULL);
|
|
matviewRel = heap_open(matviewOid, NoLock);
|
|
|
|
/* Make sure it is a materialized view. */
|
|
if (matviewRel->rd_rel->relkind != RELKIND_MATVIEW) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("\"%s\" is not a materialized view",
|
|
RelationGetRelationName(matviewRel))));
|
|
}
|
|
|
|
if (IS_PGXC_COORDINATOR) {
|
|
CheckRefreshMatview(matviewRel, false);
|
|
}
|
|
|
|
rule = matviewRel->rd_rules->rules[0];
|
|
actions = rule->actions;
|
|
if (list_length(actions) != 1) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("the rule for materialized view \"%s\" is not a single action",
|
|
RelationGetRelationName(matviewRel))));
|
|
}
|
|
|
|
dataQuery = (Query *) linitial(actions);
|
|
|
|
Query* parsetree = (Query*)copyObject(dataQuery);
|
|
deparse_query(parsetree, cquery, NIL, false, false, NULL);
|
|
char* selectstr = pstrdup(cquery->data);
|
|
pfree_ext(parsetree);
|
|
|
|
initStringInfo(cquery);
|
|
appendStringInfo(cquery, "INSERT ");
|
|
|
|
HintState *hintState = dataQuery->hintState;
|
|
if (hintState != NULL && hintState->multi_node_hint) {
|
|
appendStringInfo(cquery, " /*+ multinode */ ");
|
|
}
|
|
|
|
if (hintState != NULL && hintState->sql_ignore_hint) {
|
|
appendStringInfo(cquery, " /*+ ignore_error */ ");
|
|
}
|
|
|
|
if (relation->schemaname) {
|
|
appendStringInfo(cquery, " INTO %s.%s", quote_identifier(relation->schemaname),
|
|
quote_identifier(relation->relname));
|
|
} else {
|
|
appendStringInfo(cquery, " INTO %s", quote_identifier(relation->relname));
|
|
}
|
|
|
|
appendStringInfo(cquery, " %s", selectstr);
|
|
char *insert_select_sql = cquery->data;
|
|
|
|
raw_parsetree_list = pg_parse_query(insert_select_sql);
|
|
|
|
heap_close(matviewRel, NoLock);
|
|
|
|
Assert(IsA(linitial(raw_parsetree_list), InsertStmt));
|
|
linitial_node(InsertStmt, raw_parsetree_list)->isRewritten = true;
|
|
|
|
return pg_analyze_and_rewrite((Node*)linitial(raw_parsetree_list), insert_select_sql, NULL, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Rewrite the CREATE TABLE AS and SELECT INTO queries as a
|
|
* INSERT INTO .. SELECT query. The target table must be created first using
|
|
* utility command processing. This takes care of creating the target table on
|
|
* all the Coordinators and the Datanodes.
|
|
*/
|
|
List* QueryRewriteCTAS(Query* parsetree)
|
|
{
|
|
List* raw_parsetree_list = NIL;
|
|
CreateTableAsStmt* stmt = NULL;
|
|
Query* zparsetree = NULL;
|
|
char* view_sql = NULL;
|
|
|
|
if (parsetree->commandType != CMD_UTILITY || !IsA(parsetree->utilityStmt, CreateTableAsStmt)) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OPTIMIZER_INCONSISTENT_STATE),
|
|
errmsg("Unexpected commandType or intoClause is not set properly")));
|
|
}
|
|
|
|
/* Get the target table */
|
|
stmt = (CreateTableAsStmt*)parsetree->utilityStmt;
|
|
|
|
/* CREATE TABLE AS */
|
|
Query* cparsetree = (Query*)copyObject(parsetree);
|
|
bool hasNewColumn = stmt->into->tableElts != NULL;
|
|
char* create_sql = GetCreateTableStmt(cparsetree, stmt);
|
|
/* move stmt->into->tableElts to create_stmt->tableElts */
|
|
stmt->into->tableElts = NULL;
|
|
|
|
if (stmt->relkind == OBJECT_MATVIEW) {
|
|
zparsetree = (Query*)copyObject(cparsetree);
|
|
view_sql = GetCreateViewStmt(zparsetree, stmt);
|
|
|
|
ViewStmt *mvStmt = (ViewStmt *)zparsetree->utilityStmt;
|
|
mvStmt->mv_stmt = cparsetree->utilityStmt;
|
|
mvStmt->mv_sql = create_sql;
|
|
}
|
|
|
|
/* If MATILIZED VIEW exists, cannot send create table to DNs. */
|
|
if (stmt->relkind != OBJECT_MATVIEW) {
|
|
processutility_context proutility_cxt;
|
|
proutility_cxt.parse_tree = cparsetree->utilityStmt;
|
|
proutility_cxt.query_string = create_sql;
|
|
proutility_cxt.readOnlyTree = false;
|
|
proutility_cxt.params = NULL;
|
|
proutility_cxt.is_top_level = true;
|
|
ProcessUtility(&proutility_cxt, NULL, false, NULL, PROCESS_UTILITY_GENERATED, true);
|
|
}
|
|
|
|
/* CREATE MATILIZED VIEW AS*/
|
|
if (stmt->relkind == OBJECT_MATVIEW) {
|
|
Query *query = (Query *)stmt->query;
|
|
|
|
processutility_context proutility_cxt;
|
|
proutility_cxt.parse_tree = zparsetree->utilityStmt;
|
|
proutility_cxt.query_string = view_sql;
|
|
proutility_cxt.readOnlyTree = false;
|
|
proutility_cxt.params = NULL;
|
|
proutility_cxt.is_top_level = true;
|
|
ProcessUtility(&proutility_cxt, NULL, false, NULL, PROCESS_UTILITY_GENERATED, true);
|
|
|
|
create_matview_meta(query, stmt->into->rel, stmt->into->ivm);
|
|
|
|
/* for ivm should not execute insert into ... select just return. */
|
|
if (stmt->into->ivm) {
|
|
return NIL;
|
|
}
|
|
|
|
if (IS_PGXC_COORDINATOR && IsConnFromCoord()) {
|
|
return NIL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now fold the CTAS statement into an INSERT INTO statement. The
|
|
* utility is no more required.
|
|
*/
|
|
parsetree->utilityStmt = NULL;
|
|
|
|
/*
|
|
* Now fold the CTAS statement into an INSERT INTO statement. The
|
|
* utility is no more required.
|
|
*/
|
|
parsetree->utilityStmt = NULL;
|
|
|
|
char* insert_into_sqlstr = GetInsertIntoStmt(stmt, hasNewColumn);
|
|
|
|
raw_parsetree_list = pg_parse_query(insert_into_sqlstr);
|
|
|
|
Assert(IsA(linitial(raw_parsetree_list), InsertStmt));
|
|
linitial_node(InsertStmt, raw_parsetree_list)->isRewritten = true;
|
|
|
|
if (stmt->parserSetup != NULL)
|
|
return pg_analyze_and_rewrite_params(
|
|
(Node*)linitial(raw_parsetree_list), insert_into_sqlstr, (ParserSetupHook)stmt->parserSetup, stmt->parserSetupArg);
|
|
else {
|
|
if (strchr(insert_into_sqlstr, '$') == NULL) {
|
|
return pg_analyze_and_rewrite((Node*)linitial(raw_parsetree_list), insert_into_sqlstr, NULL, 0);
|
|
} else {
|
|
/* For plpy CTAS with $1, $2... */
|
|
return pg_analyze_and_rewrite((Node*)linitial(raw_parsetree_list),
|
|
insert_into_sqlstr,
|
|
parsetree->fixed_paramTypes,
|
|
parsetree->fixed_numParams);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get value from a subquery or non-constant expression by constructing SQL.
|
|
* input:
|
|
node: a subquery expression or non-constant expression.
|
|
* return: Const expression.
|
|
*/
|
|
Node* QueryRewriteNonConstant(Node *node)
|
|
{
|
|
Query* cparsetree = NULL;
|
|
Const* con = NULL;
|
|
List *p_target = NIL;
|
|
Node *res = NULL;
|
|
SelectStmt* select_stmt = makeNode(SelectStmt);
|
|
|
|
/* get targetList. */
|
|
TargetEntry* target = makeTargetEntry((Expr*)node, (AttrNumber)1, NULL, false);
|
|
p_target = list_make1(target);
|
|
select_stmt->targetList = list_copy(p_target);
|
|
|
|
/* construct Query node for subquery. */
|
|
cparsetree = (Query *)makeNode(Query);
|
|
cparsetree->commandType = CMD_SELECT;
|
|
cparsetree->utilityStmt = (Node *)select_stmt;
|
|
cparsetree->hasSubLinks = true;
|
|
cparsetree->canSetTag = true;
|
|
cparsetree->jointree = makeFromExpr(NULL, NULL);
|
|
cparsetree->targetList = list_copy(p_target);
|
|
|
|
StringInfo select_sql = makeStringInfo();
|
|
|
|
/* deparse the SQL statement from the subquery. */
|
|
deparse_query(cparsetree, select_sql, NIL, false, false);
|
|
|
|
StmtResult *result = NULL;
|
|
if (u_sess->attr.attr_sql.dolphin) {
|
|
int origin = u_sess->attr.attr_common.bytea_output;
|
|
u_sess->attr.attr_common.bytea_output = BYTEA_OUTPUT_HEX;
|
|
PG_TRY();
|
|
{
|
|
result = execute_stmt(select_sql->data, true);
|
|
}
|
|
PG_CATCH();
|
|
{
|
|
u_sess->attr.attr_common.bytea_output = origin;
|
|
PG_RE_THROW();
|
|
}
|
|
PG_END_TRY();
|
|
u_sess->attr.attr_common.bytea_output = origin;
|
|
} else {
|
|
result = execute_stmt(select_sql->data, true);
|
|
}
|
|
|
|
DestroyStringInfo(select_sql);
|
|
|
|
bool isnull = result->isnulls[0];
|
|
if (isnull) {
|
|
Oid collid = exprCollation(node);
|
|
/* return a null const */
|
|
con = makeConst(UNKNOWNOID, -1, collid, -2, (Datum)0, true, false);
|
|
(*result->pub.rDestroy)((DestReceiver *)result);
|
|
return (Node *)con;
|
|
}
|
|
|
|
char* value = (char *)linitial((List *)linitial(result->tuples));
|
|
Oid atttypid = result->atttypids[0];
|
|
/* convert value to const expression. */
|
|
con = processResToConst(value, atttypid, result->collids[0]);
|
|
res = atttypid == BOOLOID ? (Node *)con : type_transfer((Node *)con, atttypid, true);
|
|
|
|
(*result->pub.rDestroy)((DestReceiver *)result);
|
|
|
|
return res;
|
|
}
|
|
|
|
List* QueryRewriteSelectIntoVarList(Node *node, int res_len)
|
|
{
|
|
Query *parsetree = (Query *)((SubLink *)node)->subselect;
|
|
List *resList = NIL;
|
|
|
|
StringInfo select_sql = makeStringInfo();
|
|
deparse_query(parsetree, select_sql, NIL, false, false);
|
|
|
|
StmtResult *result = execute_stmt(select_sql->data, true);
|
|
DestroyStringInfo(select_sql);
|
|
|
|
if (result->tuples == NULL) {
|
|
ListCell *target_cell = list_head(parsetree->targetList);
|
|
for (int i = 0; i < res_len; i++, target_cell = lnext(target_cell)) {
|
|
Oid collid = exprCollation((Node*)((TargetEntry*)lfirst(target_cell))->expr);
|
|
Const *con = makeConst(UNKNOWNOID, -1, collid, -2, (Datum)0, true, false);
|
|
resList = lappend(resList, con);
|
|
}
|
|
|
|
(*result->pub.rDestroy)((DestReceiver *)result);
|
|
return resList;
|
|
}
|
|
|
|
if(result->tuples->length > 1) {
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_OPERATION),
|
|
errmsg("select result consisted of more than one row")));
|
|
}
|
|
|
|
ListCell *stmt_res_cur = list_head((List *)linitial(result->tuples));
|
|
|
|
for (int idx = 0; idx < res_len; idx++) {
|
|
Oid collid = result->collids[idx];
|
|
if (result->isnulls[idx]) {
|
|
Const *con = makeConst(UNKNOWNOID, -1, collid, -2, (Datum)0, true, false);
|
|
resList = lappend(resList, con);
|
|
} else {
|
|
char *value = (char *)lfirst(stmt_res_cur);
|
|
Oid atttypid = result->atttypids[idx];
|
|
/* convert value to const expression. */
|
|
Const *con = processResToConst(value, atttypid, collid);
|
|
Node* rnode = atttypid == BOOLOID ? (Node*)con : type_transfer((Node *)con, atttypid, true);
|
|
resList = lappend(resList, rnode);
|
|
stmt_res_cur = lnext(stmt_res_cur);
|
|
}
|
|
}
|
|
|
|
(*result->pub.rDestroy)((DestReceiver *)result);
|
|
return resList;
|
|
}
|
|
|
|
#endif
|