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Do not do the optimization that attempts to pull expression values from

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an index on that expression when processing a multi-index OR
(see check-in [a47efb7c8520a0111]) because the expression transformations
that are applied become invalid when the processing moves off of the current
index and on to the next index.  Fix for ticket [4e8e4857d32d401f].

FossilOrigin-Name: 440a7cda000164d3b46109caf2e1dde80681ba9b0d94ba9be6847d2b917445cf
This commit is contained in:
drh
2019-02-08 04:15:19 +00:00
parent 1e30c7f369
commit 8851e10017
4 changed files with 26 additions and 10 deletions
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7
src/wherecode.c
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@@ -1756,8 +1756,13 @@ Bitmask sqlite3WhereCodeOneLoopStart(
** the cursor. In this case it is important to do the full evaluation,
** as the result of the expression may not be NULL, even if all table
** column values are. https://www.sqlite.org/src/info/7fa8049685b50b5a
**
** Also, do not do this when processing one index an a multi-index
** OR clause, since the transformation will become invalid once we
** move forward to the next index.
** https://sqlite.org/src/info/4e8e4857d32d401f
*/
if( pLevel->iLeftJoin==0 ){
if( pLevel->iLeftJoin==0 && (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0 ){
whereIndexExprTrans(pIdx, iCur, iIdxCur, pWInfo);
}