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/*-------------------------------------------------------------------------
*
* clauses.h
* prototypes for clauses.c.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/optimizer/clauses.h
*
*-------------------------------------------------------------------------
*/
#ifndef CLAUSES_H
#define CLAUSES_H
#include "nodes/relation.h"
#define is_opclause(clause) ((clause) != NULL && IsA(clause, OpExpr))
#define is_funcclause(clause) ((clause) != NULL && IsA(clause, FuncExpr))
typedef struct
{
int numWindowFuncs; /* total number of WindowFuncs found */
Index maxWinRef; /* windowFuncs[] is indexed 0 .. maxWinRef */
List **windowFuncs; /* lists of WindowFuncs for each winref */
} WindowFuncLists;
extern Expr *make_opclause(Oid opno, Oid opresulttype, bool opretset,
Expr *leftop, Expr *rightop,
Oid opcollid, Oid inputcollid);
extern Node *get_leftop(const Expr *clause);
extern Node *get_rightop(const Expr *clause);
extern bool not_clause(Node *clause);
extern Expr *make_notclause(Expr *notclause);
extern Expr *get_notclausearg(Expr *notclause);
extern bool or_clause(Node *clause);
extern Expr *make_orclause(List *orclauses);
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 void count_agg_clauses(PlannerInfo *root, Node *clause,
AggClauseCosts *costs);
extern bool contain_window_function(Node *clause);
extern WindowFuncLists *find_window_functions(Node *clause, Index maxWinRef);
extern double expression_returns_set_rows(Node *clause);
extern double tlist_returns_set_rows(List *tlist);
extern bool contain_subplans(Node *clause);
extern bool contain_mutable_functions(Node *clause);
extern bool contain_volatile_functions(Node *clause);
extern bool contain_nonstrict_functions(Node *clause);
extern bool contain_leaky_functions(Node *clause);
extern Relids find_nonnullable_rels(Node *clause);
extern List *find_nonnullable_vars(Node *clause);
extern List *find_forced_null_vars(Node *clause);
extern Var *find_forced_null_var(Node *clause);
extern bool is_pseudo_constant_clause(Node *clause);
extern bool is_pseudo_constant_clause_relids(Node *clause, Relids relids);
extern int NumRelids(Node *clause);
extern void CommuteOpExpr(OpExpr *clause);
extern void CommuteRowCompareExpr(RowCompareExpr *clause);
extern Node *strip_implicit_coercions(Node *node);
extern Node *eval_const_expressions(PlannerInfo *root, Node *node);
extern Node *estimate_expression_value(PlannerInfo *root, Node *node);
extern Query *inline_set_returning_function(PlannerInfo *root,
RangeTblEntry *rte);
#endif /* CLAUSES_H */