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Make 'col IS NULL' clauses be indexable conditions.

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Teodor Sigaev, with some kibitzing from Tom Lane.
This commit is contained in:
Tom Lane
2007-04-06 22:33:43 +00:00
parent 146c83c045
commit f02a82b6ad
19 changed files with 432 additions and 110 deletions
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46
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.227 2007/02/25 17:44:01 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.228 2007/04/06 22:33:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,6 +18,7 @@
#include <limits.h>
#include "access/skey.h"
#include "nodes/makefuncs.h"
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
@ -1821,6 +1822,7 @@ fix_indexqual_references(List *indexquals, IndexPath *index_path,
Oid stratlefttype;
Oid stratrighttype;
bool recheck;
bool is_null_op = false;
Assert(IsA(rinfo, RestrictInfo));
@ -1907,6 +1909,17 @@ fix_indexqual_references(List *indexquals, IndexPath *index_path,
&opfamily);
clause_op = saop->opno;
}
else if (IsA(clause, NullTest))
{
NullTest *nt = (NullTest *) clause;
Assert(nt->nulltesttype == IS_NULL);
nt->arg = (Expr *) fix_indexqual_operand((Node *) nt->arg,
index,
&opfamily);
is_null_op = true;
clause_op = InvalidOid; /* keep compiler quiet */
}
else
{
elog(ERROR, "unsupported indexqual type: %d",
@ -1916,16 +1929,27 @@ fix_indexqual_references(List *indexquals, IndexPath *index_path,
*fixed_indexquals = lappend(*fixed_indexquals, clause);
/*
* Look up the (possibly commuted) operator in the operator family to
* get its strategy number and the recheck indicator. This also
* double-checks that we found an operator matching the index.
*/
get_op_opfamily_properties(clause_op, opfamily,
&stratno,
&stratlefttype,
&stratrighttype,
&recheck);
if (is_null_op)
{
/* IS NULL doesn't have a clause_op */
stratno = InvalidStrategy;
stratrighttype = InvalidOid;
/* We assume it's non-lossy ... might need more work someday */
recheck = false;
}
else
{
/*
* Look up the (possibly commuted) operator in the operator family
* to get its strategy number and the recheck indicator. This also
* double-checks that we found an operator matching the index.
*/
get_op_opfamily_properties(clause_op, opfamily,
&stratno,
&stratlefttype,
&stratrighttype,
&recheck);
}
*indexstrategy = lappend_int(*indexstrategy, stratno);
*indexsubtype = lappend_oid(*indexsubtype, stratrighttype);