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/*-------------------------------------------------------------------------
*
* restrictinfo.c
* RestrictInfo node manipulation routines.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/restrictinfo.c,v 1.13 2001/01/24 19:43:00 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "optimizer/clauses.h"
#include "optimizer/restrictinfo.h"
/*
* restriction_is_or_clause
*
* Returns t iff the restrictinfo node contains an 'or' clause.
*
*/
bool
restriction_is_or_clause(RestrictInfo *restrictinfo)
{
if (restrictinfo != NULL &&
or_clause((Node *) restrictinfo->clause))
return true;
else
return false;
}
/*
* get_actual_clauses
*
* Returns a list containing the clauses from 'restrictinfo_list'.
*
*/
List *
get_actual_clauses(List *restrictinfo_list)
{
List *result = NIL;
List *temp;
foreach(temp, restrictinfo_list)
{
RestrictInfo *clause = (RestrictInfo *) lfirst(temp);
result = lappend(result, clause->clause);
}
return result;
}
/*
* get_actual_join_clauses
*
* Extract clauses from 'restrictinfo_list', separating those that
* syntactically match the join level from those that were pushed down.
*/
void
get_actual_join_clauses(List *restrictinfo_list,
List **joinquals, List **otherquals)
{
List *temp;
*joinquals = NIL;
*otherquals = NIL;
foreach(temp, restrictinfo_list)
{
RestrictInfo *clause = (RestrictInfo *) lfirst(temp);
if (clause->ispusheddown)
*otherquals = lappend(*otherquals, clause->clause);
else
*joinquals = lappend(*joinquals, clause->clause);
}
}
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