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Adjust the cost estimates for RTREE such that the expected number of rows and

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expected cost is halved for each additional constraint.

FossilOrigin-Name: fd7cd0609381a85673d1f737ebeb19dde3de180f
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drh
2016-03-05 20:28:24 +00:00
parent 115305ff00
commit 2ea74dc805
3 changed files with 9 additions and 12 deletions
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ext/rtree/rtree.c
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@ -1741,7 +1741,7 @@ static int rtreeBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
return SQLITE_NOMEM;
}
nRow = pRtree->nRowEst / (iIdx + 1);
nRow = pRtree->nRowEst >> (iIdx/2);
pIdxInfo->estimatedCost = (double)6.0 * (double)nRow;
setEstimatedRows(pIdxInfo, nRow);