1 /*-------------------------------------------------------------------------
4 * prototypes for clauses.c.
7 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
10 * $Id: clauses.h,v 1.50 2001/12/10 22:54:12 tgl Exp $
12 *-------------------------------------------------------------------------
17 #include "nodes/relation.h"
19 extern Expr *make_clause(int type, Node *oper, List *args);
21 extern bool is_opclause(Node *clause);
22 extern Expr *make_opclause(Oper *op, Var *leftop, Var *rightop);
23 extern Var *get_leftop(Expr *clause);
24 extern Var *get_rightop(Expr *clause);
26 extern bool is_funcclause(Node *clause);
27 extern Expr *make_funcclause(Func *func, List *funcargs);
29 extern bool or_clause(Node *clause);
30 extern Expr *make_orclause(List *orclauses);
32 extern bool not_clause(Node *clause);
33 extern Expr *make_notclause(Expr *notclause);
34 extern Expr *get_notclausearg(Expr *notclause);
36 extern bool and_clause(Node *clause);
37 extern Expr *make_andclause(List *andclauses);
38 extern Node *make_and_qual(Node *qual1, Node *qual2);
39 extern Expr *make_ands_explicit(List *andclauses);
40 extern List *make_ands_implicit(Expr *clause);
42 extern bool contain_agg_clause(Node *clause);
43 extern List *pull_agg_clause(Node *clause);
45 extern bool contain_iter_clause(Node *clause);
47 extern bool contain_subplans(Node *clause);
48 extern List *pull_subplans(Node *clause);
49 extern void check_subplans_for_ungrouped_vars(Query *query);
51 extern bool contain_noncachable_functions(Node *clause);
53 extern bool is_pseudo_constant_clause(Node *clause);
54 extern List *pull_constant_clauses(List *quals, List **constantQual);
56 extern bool has_distinct_on_clause(Query *query);
58 extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
59 extern int NumRelids(Node *clause);
60 extern void CommuteClause(Expr *clause);
62 extern Node *eval_const_expressions(Node *node);
64 extern bool expression_tree_walker(Node *node, bool (*walker) (),
66 extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
68 extern bool query_tree_walker(Query *query, bool (*walker) (),
69 void *context, bool visitQueryRTEs);
70 extern void query_tree_mutator(Query *query, Node *(*mutator) (),
71 void *context, bool visitQueryRTEs);
73 #define is_subplan(clause) ((clause) != NULL && \
74 IsA(clause, Expr) && \
75 ((Expr *) (clause))->opType == SUBPLAN_EXPR)
77 #endif /* CLAUSES_H */