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Bug: backend crashes in btbeginscan()->btrescan()->_bt_orderkeys()

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when btree used in innerscan with run-time key which value
passed by pointer.

Fix: keys ordering stuff moved to _bt_first().

Pointed by Thomas Lockhart.
This commit is contained in:
Vadim B. Mikheev
1997-05-05 03:41:19 +00:00
parent 917abdd140
commit c3b51e0d67
2 changed files with 31 additions and 24 deletions
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25
src/backend/access/nbtree/nbtree.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.18 1997/04/18 03:37:53 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.19 1997/05/05 03:41:17 vadim Exp $
*
* NOTES
* This file contains only the public interface routines.
@@ -410,7 +410,6 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
{
ItemPointer iptr;
BTScanOpaque so;
StrategyNumber strat;
so = (BTScanOpaque) scan->opaque;
@@ -439,10 +438,11 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
scan->flags = 0x0;
}
/* reset the scan key */
/*
* Reset the scan keys. Note that keys ordering stuff
* moved to _bt_first. - vadim 05/05/97
*/
so->numberOfKeys = scan->numberOfKeys;
so->numberOfFirstKeys = 0; /* may be changed by _bt_orderkeys */
so->qual_ok = 1; /* may be changed by _bt_orderkeys */
if (scan->numberOfKeys > 0) {
memmove(scan->keyData,
scankey,
@@ -450,21 +450,6 @@ btrescan(IndexScanDesc scan, bool fromEnd, ScanKey scankey)
memmove(so->keyData,
scankey,
so->numberOfKeys * sizeof(ScanKeyData));
/* order the keys in the qualification */
_bt_orderkeys(scan->relation, so);
}
/* finally, be sure that the scan exploits the tree order */
scan->scanFromEnd = false;
if ( so->numberOfKeys > 0 ) {
strat = _bt_getstrat(scan->relation, 1 /* XXX */,
so->keyData[0].sk_procedure);
if (strat == BTLessStrategyNumber
|| strat == BTLessEqualStrategyNumber)
scan->scanFromEnd = true;
} else {
scan->scanFromEnd = true;
}
}