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Disable the skip-scan optimization for DISTINCT queries.

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Fix for ticket [ced41c7c7d6b4d36]

FossilOrigin-Name: a871d69c6de65038360aa6142fbad22689fb347e526cca56bb83e695c1441fbe
This commit is contained in:
drh
2019-07-30 01:17:03 +00:00
parent 8fbcb04811
commit 822bc969f6
4 changed files with 26 additions and 8 deletions
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src/where.c
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@@ -2723,6 +2723,7 @@ static int whereLoopAddBtreeIndex(
&& pProbe->noSkipScan==0
&& OptimizationEnabled(db, SQLITE_SkipScan)
&& pProbe->aiRowLogEst[saved_nEq+1]>=42 /* TUNING: Minimum for skip-scan */
&& (pWInfo->wctrlFlags & (WHERE_WANT_DISTINCT|WHERE_DISTINCTBY))==0
&& (rc = whereLoopResize(db, pNew, pNew->nLTerm+1))==SQLITE_OK
){
LogEst nIter;