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>   INDEXED searches in some cases DO NOT WORK.
>   Although simple search expressions (i.e. with a constant value on
> the right side of an operator) work, performing a join (by putting
> a field of some other table on the right side of an operator) produces
> empty output.
>   WITHOUT indices, everything works fine.
>

submitted by: "Vadim B. Mikheev" <root@ais.sable.krasnoyarsk.su>
This commit is contained in:
Marc G. Fournier
1996-07-30 07:56:04 +00:00
parent e5e12f6405
commit 74cdf92868
4 changed files with 86 additions and 38 deletions
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11
src/backend/access/nbtree/nbtsearch.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.1.1.1 1996/07/09 06:21:12 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtsearch.c,v 1.2 1996/07/30 07:56:02 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -604,6 +604,10 @@ _bt_first(IndexScanDesc scan, ScanDirection dir)
BTScanOpaque so;
ScanKeyData skdata;
so = (BTScanOpaque) scan->opaque;
if ( so->qual_ok == 0 ) /* may be set by _bt_orderkeys */
return ((RetrieveIndexResult) NULL);
/* if we just need to walk down one edge of the tree, do that */
if (scan->scanFromEnd)
return (_bt_endpoint(scan, dir));
@@ -611,7 +615,6 @@ _bt_first(IndexScanDesc scan, ScanDirection dir)
rel = scan->relation;
itupdesc = RelationGetTupleDescriptor(scan->relation);
current = &(scan->currentItemData);
so = (BTScanOpaque) scan->opaque;
/*
* Okay, we want something more complicated. What we'll do is use
@@ -628,7 +631,7 @@ _bt_first(IndexScanDesc scan, ScanDirection dir)
*/
proc = index_getprocid(rel, 1, BTORDER_PROC);
ScanKeyEntryInitialize(&skdata, 0x0, 1, proc,
scan->keyData[0].sk_argument);
so->keyData[0].sk_argument);
stack = _bt_search(rel, 1, &skdata, &buf);
_bt_freestack(stack);
@@ -666,7 +669,7 @@ _bt_first(IndexScanDesc scan, ScanDirection dir)
*/
result = _bt_compare(rel, itupdesc, page, 1, &skdata, offnum);
strat = _bt_getstrat(rel, 1, scan->keyData[0].sk_procedure);
strat = _bt_getstrat(rel, 1, so->keyData[0].sk_procedure);
switch (strat) {
case BTLessStrategyNumber: