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/*-------------------------------------------------------------------------
*
* 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 2001/03/22 04:00:53 momjian 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 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 */
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