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Fix a bug in the reverse scan logic that comes up when the table being

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scanned is empty.  Add additional tests for the reverse scan. (CVS 797)

FossilOrigin-Name: 0051c87d5e8d07fae09da2eb7b0d8cbd1bbd3c8e
This commit is contained in:
drh
2002-12-04 22:29:28 +00:00
parent dd4852c3d1
commit 1a844c380b
5 changed files with 125 additions and 17 deletions
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16
src/vdbe.c
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@@ -36,7 +36,7 @@
** in this file for details. If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.186 2002/12/04 20:01:06 drh Exp $
** $Id: vdbe.c,v 1.187 2002/12/04 22:29:29 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -3394,9 +3394,17 @@ case OP_MoveTo: {
if( res && pOp->p2>0 ){
pc = pOp->p2 - 1;
}
}else if( oc==OP_MoveLt && res>=0 ){
sqliteBtreePrevious(pC->pCursor, &res);
pC->recnoIsValid = 0;
}else if( oc==OP_MoveLt ){
if( res>=0 ){
sqliteBtreePrevious(pC->pCursor, &res);
pC->recnoIsValid = 0;
}else{
/* res might be negative because the table is empty. Check to
** see if this is the case.
*/
int keysize;
res = sqliteBtreeKeySize(pC->pCursor,&keysize)!=0 || keysize==0;
}
if( res && pOp->p2>0 ){
pc = pOp->p2 - 1;
}