/*-------------------------------------------------------------------------
 *
 * clauses.h--
 *	  prototypes for clauses.c.
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: clauses.h,v 1.5 1997/09/08 02:37:34 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef CLAUSES_H
#define CLAUSES_H

#include <nodes/primnodes.h>

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 List *pull_constant_clauses(List * quals, List ** constantQual);
extern void clause_relids_vars(Node * clause, List ** relids, List ** vars);
extern int	NumRelids(Node * clause);
extern bool contains_not(Node * clause);
extern bool join_clause_p(Node * clause);
extern bool qual_clause_p(Node * clause);
extern void fix_opid(Node * clause);
extern List *fix_opids(List * clauses);
extern void
get_relattval(Node * clause, 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(Node * clause);

#endif							/* CLAUSES_H */
