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Fix the query plan for an indexed lookup on a WITHOUT ROWID table with

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a DESC primary key when the primary key is constrained by an inequality.
See [forum:/forumpost/8988341615|forum post 8988341615]. Test cases in TH3.

FossilOrigin-Name: f65c929bf189cf5ca5f1cacdbbb8eec014c9960f767b135023bd2323cd26f279
This commit is contained in:
drh
2021-05-12 22:02:14 +00:00
parent 52d1407891
commit 0564cc2601
3 changed files with 9 additions and 9 deletions
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4
src/wherecode.c
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@@ -1749,8 +1749,8 @@ Bitmask sqlite3WhereCodeOneLoopStart(
** a forward order scan on a descending index, interchange the
** start and end terms (pRangeStart and pRangeEnd).
*/
if( (nEq<pIdx->nKeyCol && bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC))
|| (bRev && pIdx->nKeyCol==nEq)
if( (nEq<pIdx->nColumn && bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC))
|| (bRev && pIdx->nColumn==nEq)
){
SWAP(WhereTerm *, pRangeEnd, pRangeStart);
SWAP(u8, bSeekPastNull, bStopAtNull);