205 lines
9.0 KiB
C
205 lines
9.0 KiB
C
/* -------------------------------------------------------------------------
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*
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* parse_node.h
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* Internal definitions for parser
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*
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*
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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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* src/include/parser/parse_node.h
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef PARSE_NODE_H
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#define PARSE_NODE_H
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#include "nodes/parsenodes.h"
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#include "parser/analyze.h"
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#include "utils/relcache.h"
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typedef struct PlusJoinRTEInfo {
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bool needrecord; /* need record the RTE info for plus join? only in WhereClause is true for now */
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List* info; /* List of PlusJoinRTEItem we record */
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} PlusJoinRTEInfo;
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/*
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* Function signatures for parser hooks
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*/
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typedef struct ParseState ParseState;
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typedef Node* (*PreParseColumnRefHook)(ParseState* pstate, ColumnRef* cref);
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typedef Node* (*PostParseColumnRefHook)(ParseState* pstate, ColumnRef* cref, Node* var);
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typedef Node* (*ParseParamRefHook)(ParseState* pstate, ParamRef* pref);
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typedef Node* (*CoerceParamHook)(ParseState* pstate, Param* param, Oid targetTypeId, int32 targetTypeMod, int location);
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/*
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* State information used during parse analysis
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*
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* parentParseState: NULL in a top-level ParseState. When parsing a subquery,
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* links to current parse state of outer query.
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*
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* p_sourcetext: source string that generated the raw parsetree being
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* analyzed, or NULL if not available. (The string is used only to
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* generate cursor positions in error messages: we need it to convert
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* byte-wise locations in parse structures to character-wise cursor
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* positions.)
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*
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* p_rtable: list of RTEs that will become the rangetable of the query.
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* Note that neither relname nor refname of these entries are necessarily
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* unique; searching the rtable by name is a bad idea.
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*
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* p_joinexprs: list of JoinExpr nodes associated with p_rtable entries.
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* This is one-for-one with p_rtable, but contains NULLs for non-join
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* RTEs, and may be shorter than p_rtable if the last RTE(s) aren't joins.
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*
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* p_joinlist: list of join items (RangeTblRef and JoinExpr nodes) that
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* will become the fromlist of the query's top-level FromExpr node.
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*
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* p_relnamespace: list of RTEs that represents the current namespace for
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* table lookup, ie, those RTEs that are accessible by qualified names.
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* This may be just a subset of the rtable + joinlist, and/or may contain
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* entries that are not yet added to the main joinlist.
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*
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* p_varnamespace: list of RTEs that represents the current namespace for
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* column lookup, ie, those RTEs that are accessible by unqualified names.
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* This is different from p_relnamespace because a JOIN without an alias does
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* not hide the contained tables (so they must still be in p_relnamespace)
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* but it does hide their columns (unqualified references to the columns must
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* refer to the JOIN, not the member tables). Other special RTEs such as
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* NEW/OLD for rules may also appear in just one of these lists.
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*
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* p_ctenamespace: list of CommonTableExprs (WITH items) that are visible
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* at the moment. This is different from p_relnamespace because you have
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* to make an RTE before you can access a CTE.
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*
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* p_future_ctes: list of CommonTableExprs (WITH items) that are not yet
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* visible due to scope rules. This is used to help improve error messages.
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*
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* p_parent_cte: CommonTableExpr that immediately contains the current query,
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* if any.
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*
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* p_windowdefs: list of WindowDefs representing WINDOW and OVER clauses.
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* We collect these while transforming expressions and then transform them
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* afterwards (so that any resjunk tlist items needed for the sort/group
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* clauses end up at the end of the query tlist). A WindowDef's location in
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* this list, counting from 1, is the winref number to use to reference it.
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*/
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struct ParseState {
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struct ParseState* parentParseState; /* stack link */
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const char* p_sourcetext; /* source text, or NULL if not available */
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List* p_rtable; /* range table so far */
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List* p_joinexprs; /* JoinExprs for RTE_JOIN p_rtable entries */
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List* p_joinlist; /* join items so far (will become FromExpr
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node's fromlist) */
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List* p_relnamespace; /* current namespace for relations */
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List* p_varnamespace; /* current namespace for columns */
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bool p_lateral_active; /* p_lateral_only items visible? */
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List* p_ctenamespace; /* current namespace for common table exprs */
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List* p_future_ctes; /* common table exprs not yet in namespace */
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CommonTableExpr* p_parent_cte; /* this query's containing CTE */
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List* p_windowdefs; /* raw representations of window clauses */
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int p_next_resno; /* next targetlist resno to assign */
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List* p_locking_clause; /* raw FOR UPDATE/FOR SHARE info */
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Node* p_value_substitute; /* what to replace VALUE with, if any */
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bool p_hasAggs;
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bool p_hasWindowFuncs;
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bool p_hasSubLinks;
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bool p_hasModifyingCTE;
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bool p_is_insert;
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bool p_locked_from_parent;
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bool p_resolve_unknowns; /* resolve unknown-type SELECT outputs as type text */
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bool p_hasSynonyms;
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Relation p_target_relation;
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RangeTblEntry* p_target_rangetblentry;
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/*
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* Optional hook functions for parser callbacks. These are null unless
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* set up by the caller of make_parsestate.
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*/
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PreParseColumnRefHook p_pre_columnref_hook;
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PostParseColumnRefHook p_post_columnref_hook;
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ParseParamRefHook p_paramref_hook;
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CoerceParamHook p_coerce_param_hook;
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void* p_ref_hook_state; /* common passthrough link for above */
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List* p_target_list;
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/*
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* star flag info
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*
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* create table t1(a int, b int);
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* create table t2(a int, b int);
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*
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* For query: select * from t1
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* star_start = 1;
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* star_end = 2;
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* star_only = 1;
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*
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* For query: select t1.*, t2.* from t1, t2
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* star_start = 1, 3;
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* star_end = 2, 4;
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* star_only = -1, -1;
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*/
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List* p_star_start;
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List* p_star_end;
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List* p_star_only;
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/*
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* The p_is_in_insert will indicate the sub link is under one top insert statement.
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* When p_is_in_insert is true, then we will check if sub link include foreign table,
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* If foreign is found, we will set top level insert ParseState's p_is_foreignTbl_exist to true.
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* Finially, we will set p_is_td_compatible_truncation to true if the td_compatible_truncation guc
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* parameter is on, no foreign table involved in this insert statement.
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*/
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bool p_is_foreignTbl_exist; /* make there is foreign table founded. */
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bool p_is_in_insert; /* mark the subquery is under one insert statement. */
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bool p_is_td_compatible_truncation; /* mark the auto truncation for insert statement is enabled. */
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TdTruncCastStatus tdTruncCastStatus; /* Auto truncation Cast added, only used for stmt in stored procedure or
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prepare stmt. */
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bool isAliasReplace; /* Mark if permit replace. */
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/*
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* Fields for transform "(+)" to outerjoin
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*/
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bool ignoreplus; /*
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* Whether ignore "(+)" during transform stmt? False is default,
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* report error when found "(+)". Only true when transform WhereClause
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* in SelectStmt.
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*/
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PlusJoinRTEInfo* p_plusjoin_rte_info; /* The RTE info while processing "(+)" */
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};
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/* An element of p_relnamespace or p_varnamespace */
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typedef struct ParseNamespaceItem
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{
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RangeTblEntry *p_rte; /* The relation's rangetable entry */
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bool p_lateral_only; /* Is only visible to LATERAL expressions? */
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bool p_lateral_ok; /* If so, does join type allow use? */
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} ParseNamespaceItem;
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/* Support for parser_errposition_callback function */
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typedef struct ParseCallbackState {
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ParseState* pstate;
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int location;
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#ifndef FRONTEND
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ErrorContextCallback errcontext;
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#endif
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} ParseCallbackState;
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extern ParseState* make_parsestate(ParseState* parentParseState);
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extern void free_parsestate(ParseState* pstate);
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extern int parser_errposition(ParseState* pstate, int location);
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extern void setup_parser_errposition_callback(ParseCallbackState* pcbstate, ParseState* pstate, int location);
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extern void cancel_parser_errposition_callback(ParseCallbackState* pcbstate);
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extern Var* make_var(ParseState* pstate, RangeTblEntry* rte, int attrno, int location);
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extern Var* ts_make_var(ParseState* pstate, RangeTblEntry* rte, int attrno, int location);
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extern Oid transformArrayType(Oid* arrayType, int32* arrayTypmod);
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extern ArrayRef* transformArraySubscripts(ParseState* pstate, Node* arrayBase, Oid arrayType, Oid elementType,
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int32 arrayTypMod, List* indirection, Node* assignFrom);
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extern Const* make_const(ParseState* pstate, Value* value, int location);
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#endif /* PARSE_NODE_H */
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