mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-16 19:37:00 +08:00
a1e17cd5c5
has a DISTINCT ON clause, per bug report from Anthony Wood. While at it, improve the DISTINCT-ON-clause recognizer routine to not be fooled by out- of-order DISTINCT lists. Also, back-patch earlier fix to not push down into sub-SELECT with LIMIT.
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* clauses.h
|
|
* prototypes for clauses.c.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $Id: clauses.h,v 1.43.2.1 2001/07/31 18:39:13 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef CLAUSES_H
|
|
#define CLAUSES_H
|
|
|
|
#include "nodes/relation.h"
|
|
|
|
/*
|
|
* Flag bits returned by get_relattval().
|
|
* These are used in selectivity-estimation routines, too.
|
|
*/
|
|
#define SEL_CONSTANT 1 /* operator's non-var arg is a constant */
|
|
#define SEL_RIGHT 2 /* operator's non-var arg is on the right */
|
|
|
|
|
|
extern Expr *make_clause(int type, Node *oper, List *args);
|
|
|
|
extern bool is_opclause(Node *clause);
|
|
extern Expr *make_opclause(Oper *op, Var *leftop, Var *rightop);
|
|
extern Var *get_leftop(Expr *clause);
|
|
extern Var *get_rightop(Expr *clause);
|
|
|
|
extern bool is_funcclause(Node *clause);
|
|
extern Expr *make_funcclause(Func *func, List *funcargs);
|
|
|
|
extern bool or_clause(Node *clause);
|
|
extern Expr *make_orclause(List *orclauses);
|
|
|
|
extern bool not_clause(Node *clause);
|
|
extern Expr *make_notclause(Expr *notclause);
|
|
extern Expr *get_notclausearg(Expr *notclause);
|
|
|
|
extern bool and_clause(Node *clause);
|
|
extern Expr *make_andclause(List *andclauses);
|
|
extern Node *make_and_qual(Node *qual1, Node *qual2);
|
|
extern Expr *make_ands_explicit(List *andclauses);
|
|
extern List *make_ands_implicit(Expr *clause);
|
|
|
|
extern bool contain_agg_clause(Node *clause);
|
|
extern List *pull_agg_clause(Node *clause);
|
|
|
|
extern bool contain_subplans(Node *clause);
|
|
extern List *pull_subplans(Node *clause);
|
|
extern void check_subplans_for_ungrouped_vars(Node *clause, Query *query);
|
|
|
|
extern bool contain_noncachable_functions(Node *clause);
|
|
|
|
extern bool is_pseudo_constant_clause(Node *clause);
|
|
extern List *pull_constant_clauses(List *quals, List **constantQual);
|
|
|
|
extern bool has_distinct_on_clause(Query *query);
|
|
|
|
extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
|
|
extern int NumRelids(Node *clause);
|
|
extern void get_relattval(Node *clause, int targetrelid,
|
|
int *relid, AttrNumber *attno,
|
|
Datum *constval, int *flag);
|
|
extern void get_rels_atts(Node *clause, int *relid1,
|
|
AttrNumber *attno1, int *relid2, AttrNumber *attno2);
|
|
extern void CommuteClause(Expr *clause);
|
|
|
|
extern Node *eval_const_expressions(Node *node);
|
|
|
|
extern bool expression_tree_walker(Node *node, bool (*walker) (),
|
|
void *context);
|
|
extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
|
|
void *context);
|
|
extern bool query_tree_walker(Query *query, bool (*walker) (),
|
|
void *context, bool visitQueryRTEs);
|
|
extern void query_tree_mutator(Query *query, Node *(*mutator) (),
|
|
void *context, bool visitQueryRTEs);
|
|
|
|
#define is_subplan(clause) ((clause) != NULL && \
|
|
IsA(clause, Expr) && \
|
|
((Expr *) (clause))->opType == SUBPLAN_EXPR)
|
|
|
|
#endif /* CLAUSES_H */
|