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6bc601b648
to go along with expression_tree_walker. (_walker is not suitable for routines that need to alter the tree structure significantly.) Other minor cleanups in clauses.c.
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* clauses.h
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* prototypes for clauses.c.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: clauses.h,v 1.25 1999/08/09 00:51:23 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef CLAUSES_H
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#define CLAUSES_H
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#include "nodes/relation.h"
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extern Expr *make_clause(int type, Node *oper, List *args);
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extern bool is_opclause(Node *clause);
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extern Expr *make_opclause(Oper *op, Var *leftop, Var *rightop);
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extern Var *get_leftop(Expr *clause);
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extern Var *get_rightop(Expr *clause);
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extern bool is_funcclause(Node *clause);
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extern Expr *make_funcclause(Func *func, List *funcargs);
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extern bool or_clause(Node *clause);
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extern Expr *make_orclause(List *orclauses);
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extern bool not_clause(Node *clause);
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extern Expr *make_notclause(Expr *notclause);
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extern Expr *get_notclausearg(Expr *notclause);
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extern bool and_clause(Node *clause);
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extern Expr *make_andclause(List *andclauses);
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extern Expr *make_ands_explicit(List *andclauses);
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extern List *make_ands_implicit(Expr *clause);
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extern bool case_clause(Node *clause);
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extern List *pull_constant_clauses(List *quals, List **constantQual);
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extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
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extern int NumRelids(Node *clause);
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extern bool is_joinable(Node *clause);
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extern bool qual_clause_p(Node *clause);
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extern List *fix_opids(List *clauses);
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extern void get_relattval(Node *clause, int targetrelid,
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int *relid, AttrNumber *attno,
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Datum *constval, int *flag);
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extern void get_rels_atts(Node *clause, int *relid1,
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AttrNumber *attno1, int *relid2, AttrNumber *attno2);
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extern void CommuteClause(Node *clause);
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extern bool expression_tree_walker(Node *node, bool (*walker) (),
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void *context);
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extern Node *expression_tree_mutator(Node *node, Node * (*mutator) (),
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void *context);
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#define is_subplan(clause) ((Node*) (clause) != NULL && \
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nodeTag((Node*) (clause)) == T_Expr && \
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((Expr *) (clause))->opType == SUBPLAN_EXPR)
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#endif /* CLAUSES_H */
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