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/*-------------------------------------------------------------------------
*
* clauseinfo.c--
* ClauseInfo node manipulation routines.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/Attic/clauseinfo.c,v 1.7 1998/02/26 04:33:09 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "nodes/relation.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/internal.h"
#include "optimizer/clauses.h"
#include "optimizer/clauseinfo.h"
/*
* valid-or-clause--
*
* Returns t iff the clauseinfo node contains a 'normal' 'or' clause.
*
*/
bool
valid_or_clause(CInfo *clauseinfo)
{
if (clauseinfo != NULL &&
!single_node((Node *) clauseinfo->clause) &&
!clauseinfo->notclause &&
or_clause((Node *) clauseinfo->clause))
return (true);
else
return (false);
}
/*
* get-actual-clauses--
*
* Returns a list containing the clauses from 'clauseinfo-list'.
*
*/
List *
get_actual_clauses(List *clauseinfo_list)
{
List *temp = NIL;
List *result = NIL;
CInfo *clause = (CInfo *) NULL;
foreach(temp, clauseinfo_list)
{
clause = (CInfo *) lfirst(temp);
result = lappend(result, clause->clause);
}
return (result);
}
/*
* XXX NOTE:
* The following routines must return their contents in the same order
* (e.g., the first clause's info should be first, and so on) or else
* get_index_sel() won't work.
*
*/
/*
* get_relattvals--
* For each member of a list of clauseinfo nodes to be used with an
* index, create a vectori-long specifying:
* the attnos,
* the values of the clause constants, and
* flags indicating the type and location of the constant within
* each clause.
* Each clause is of the form (op var some_type_of_constant), thus the
* flag indicating whether the constant is on the left or right should
* always be *SELEC-CONSTANT-RIGHT*.
*
* 'clauseinfo-list' is a list of clauseinfo nodes
*
* Returns a list of vectori-longs.
*
*/
void
get_relattvals(List *clauseinfo_list,
List **attnos,
List **values,
List **flags)
{
List *result1 = NIL;
List *result2 = NIL;
List *result3 = NIL;
CInfo *temp = (CInfo *) NULL;
List *i = NIL;
foreach(i, clauseinfo_list)
{
int dummy;
AttrNumber attno;
Datum constval;
int flag;
temp = (CInfo *) lfirst(i);
get_relattval((Node *) temp->clause, &dummy, &attno, &constval, &flag);
result1 = lappendi(result1, (int) attno);
result2 = lappendi(result2, constval);
result3 = lappendi(result3, flag);
}
*attnos = result1;
*values = result2;
*flags = result3;
return;
}
/*
* get_joinvars --
* Given a list of join clauseinfo nodes to be used with the index
* of an inner join relation, return three lists consisting of:
* the attributes corresponding to the inner join relation
* the value of the inner var clause (always "")
* whether the attribute appears on the left or right side of
* the operator.
*
* 'relid' is the inner join relation
* 'clauseinfo-list' is a list of qualification clauses to be used with
* 'rel'
*
*/
void
get_joinvars(Oid relid,
List *clauseinfo_list,
List **attnos,
List **values,
List **flags)
{
List *result1 = NIL;
List *result2 = NIL;
List *result3 = NIL;
List *temp;
foreach(temp, clauseinfo_list)
{
CInfo *clauseinfo = lfirst(temp);
Expr *clause = clauseinfo->clause;
if (IsA(get_leftop(clause), Var) &&
(relid == (get_leftop(clause))->varno))
{
result1 = lappendi(result1, (int4) (get_leftop(clause))->varattno);
result2 = lappend(result2, "");
result3 = lappendi(result3, _SELEC_CONSTANT_RIGHT_);
}
else
{
result1 = lappendi(result1, (int4) (get_rightop(clause))->varattno);
result2 = lappend(result2, "");
result3 = lappendi(result3, _SELEC_CONSTANT_LEFT_);
}
}
*attnos = result1;
*values = result2;
*flags = result3;
return;
}
/*
* get_opnos--
* Create and return a list containing the clause operators of each member
* of a list of clauseinfo nodes to be used with an index.
*
*/
List *
get_opnos(List *clauseinfo_list)
{
CInfo *temp = (CInfo *) NULL;
List *result = NIL;
List *i = NIL;
foreach(i, clauseinfo_list)
{
temp = (CInfo *) lfirst(i);
result =
lappendi(result,
(((Oper *) temp->clause->oper)->opno));
}
return (result);
}
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