1 /*-------------------------------------------------------------------------
4 * prototypes for clauses.c.
7 * Copyright (c) 1994, Regents of the University of California
9 * $Id: clauses.h,v 1.20 1999/07/15 15:21:19 momjian Exp $
11 *-------------------------------------------------------------------------
16 #include <nodes/relation.h>
18 extern Expr *make_clause(int type, Node *oper, List *args);
20 extern bool is_opclause(Node *clause);
21 extern Expr *make_opclause(Oper *op, Var *leftop, Var *rightop);
22 extern Var *get_leftop(Expr *clause);
23 extern Var *get_rightop(Expr *clause);
25 extern bool is_funcclause(Node *clause);
26 extern Expr *make_funcclause(Func *func, List *funcargs);
28 extern bool or_clause(Node *clause);
29 extern Expr *make_orclause(List *orclauses);
31 extern bool not_clause(Node *clause);
32 extern Expr *make_notclause(Expr *notclause);
33 extern Expr *get_notclausearg(Expr *notclause);
35 extern bool and_clause(Node *clause);
36 extern Expr *make_andclause(List *andclauses);
38 extern bool case_clause(Node *clause);
40 extern List *pull_constant_clauses(List *quals, List **constantQual);
41 extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
42 extern int NumRelids(Node *clause);
43 extern bool contains_not(Node *clause);
44 extern bool is_joinable(Node *clause);
45 extern bool qual_clause_p(Node *clause);
46 extern void fix_opid(Node *clause);
47 extern List *fix_opids(List *clauses);
48 extern void get_relattval(Node *clause, int *relid,
49 AttrNumber *attno, Datum *constval, int *flag);
50 extern void get_rels_atts(Node *clause, int *relid1,
51 AttrNumber *attno1, int *relid2, AttrNumber *attno2);
52 extern void CommuteClause(Node *clause);
54 extern bool expression_tree_walker(Node *node, bool (*walker) (),
57 #define is_subplan(clause) ((Node*) (clause) != NULL && \
58 nodeTag((Node*) (clause)) == T_Expr && \
59 ((Expr *) (clause))->opType == SUBPLAN_EXPR)
61 #endif /* CLAUSES_H */