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Improved optimization of ORDER BY.

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FossilOrigin-Name: 97e5c70f2f19a1bca70dd2221b757b9e5418fce0
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drh
2013-03-27 16:05:30 +00:00
parent 8a1b87cb97
commit 2b6c874b13
3 changed files with 9 additions and 11 deletions
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3
src/where.c
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@@ -3486,7 +3486,8 @@ static void bestBtreeIndex(WhereBestIdx *p){
** So this computation assumes table records are about twice as big
** as index records
*/
if( (pc.plan.wsFlags&~(WHERE_REVERSE|WHERE_ORDERED))==WHERE_IDX_ONLY
if( (pc.plan.wsFlags&~(WHERE_REVERSE|WHERE_ORDERED|WHERE_OB_UNIQUE))
==WHERE_IDX_ONLY
&& (pWC->wctrlFlags & WHERE_ONEPASS_DESIRED)==0
&& sqlite3GlobalConfig.bUseCis
&& OptimizationEnabled(pParse->db, SQLITE_CoverIdxScan)