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/*-------------------------------------------------------------------------
*
* parse_oper.h
*
*
*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: parse_oper.h,v 1.22 2002/09/04 20:31:45 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PARSE_OPER_H
#define PARSE_OPER_H
#include "access/htup.h"
#include "nodes/parsenodes.h"
typedef HeapTuple Operator;
/* Routines to look up an operator given name and exact input type(s) */
extern Oid LookupOperName(List *opername, Oid oprleft, Oid oprright);
extern Oid LookupOperNameTypeNames(List *opername, TypeName *oprleft,
TypeName *oprright, const char *caller);
/* Routines to find operators matching a name and given input types */
/* NB: the selected operator may require coercion of the input types! */
extern Operator oper(List *op, Oid arg1, Oid arg2, bool noError);
extern Operator right_oper(List *op, Oid arg, bool noError);
extern Operator left_oper(List *op, Oid arg, bool noError);
/* Routines to find operators that DO NOT require coercion --- ie, their */
/* input types are either exactly as given, or binary-compatible */
extern Operator compatible_oper(List *op, Oid arg1, Oid arg2, bool noError);
/* currently no need for compatible_left_oper/compatible_right_oper */
/* Convenience routines that call compatible_oper() and return either */
/* the operator OID or the underlying function OID, or InvalidOid if fail */
extern Oid compatible_oper_opid(List *op, Oid arg1, Oid arg2, bool noError);
extern Oid compatible_oper_funcid(List *op, Oid arg1, Oid arg2, bool noError);
/* Convenience routine that packages a specific call on compatible_oper */
extern Oid any_ordering_op(Oid argtype);
/* Extract operator OID or underlying-function OID from an Operator tuple */
extern Oid oprid(Operator op);
extern Oid oprfuncid(Operator op);
#endif /* PARSE_OPER_H */
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