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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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13
src/backend/access/common/scankey.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/common/scankey.c,v 1.29 2007/01/05 22:19:21 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/common/scankey.c,v 1.30 2007/04/06 22:33:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -20,7 +20,8 @@
/*
* ScanKeyEntryInitialize
* Initializes a scan key entry given all the field values.
* The target procedure is specified by OID.
* The target procedure is specified by OID (but can be invalid
* if SK_SEARCHNULL is set).
*
* Note: CurrentMemoryContext at call should be as long-lived as the ScanKey
* itself, because that's what will be used for any subsidiary info attached
@ -40,7 +41,13 @@ ScanKeyEntryInitialize(ScanKey entry,
entry->sk_strategy = strategy;
entry->sk_subtype = subtype;
entry->sk_argument = argument;
fmgr_info(procedure, &entry->sk_func);
if (RegProcedureIsValid(procedure))
fmgr_info(procedure, &entry->sk_func);
else
{
Assert(flags & SK_SEARCHNULL);
MemSet(&entry->sk_func, 0, sizeof(entry->sk_func));
}
}
/*