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Make SQLite slightly more likely to use an auto-index within a sub-query.

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FossilOrigin-Name: ab832336f4a28193c4d2b61e833564822a7b86a8
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dan
2015-03-16 20:40:00 +00:00
parent 05b6048dbd
commit f104abba84
3 changed files with 11 additions and 11 deletions
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6
src/where.c
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@@ -6001,10 +6001,10 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
/* Seed the search with a single WherePath containing zero WhereLoops.
**
** TUNING: Do not let the number of iterations go above 25. If the cost
** of computing an automatic index is not paid back within the first 25
** TUNING: Do not let the number of iterations go above 28. If the cost
** of computing an automatic index is not paid back within the first 28
** rows, then do not use the automatic index. */
aFrom[0].nRow = MIN(pParse->nQueryLoop, 46); assert( 46==sqlite3LogEst(25) );
aFrom[0].nRow = MIN(pParse->nQueryLoop, 48); assert( 48==sqlite3LogEst(28) );
nFrom = 1;
assert( aFrom[0].isOrdered==0 );
if( nOrderBy ){