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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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7
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.74 2002/12/04 13:40:26 drh Exp $
** $Id: btree.c,v 1.75 2002/12/04 22:29:28 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -1495,7 +1495,8 @@ int sqliteBtreeLast(BtCursor *pCur, int *pRes){
** this value is as follows:
**
** *pRes<0 The cursor is left pointing at an entry that
** is smaller than pKey.
** is smaller than pKey or if the table is empty
** and the cursor is therefore left point to nothing.
**
** *pRes==0 The cursor is left pointing at an entry that
** exactly matches pKey.
@@ -1513,7 +1514,7 @@ int sqliteBtreeMoveto(BtCursor *pCur, const void *pKey, int nKey, int *pRes){
int lwr, upr;
Pgno chldPg;
MemPage *pPage = pCur->pPage;
int c = -1;
int c = -1; /* pRes return if table is empty must be -1 */
lwr = 0;
upr = pPage->nCell-1;
while( lwr<=upr ){