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Take steps to avoid misestimating range query costs based on STAT4 data

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due to the roundoff error of converting from integers to LogEst and back
to integers.

FossilOrigin-Name: 3c933bf95f291f7957580d823dce92c981375a5c
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drh
2014-10-22 15:27:05 +00:00
parent 442c5cd3cf
commit 9f07cf7b2e
5 changed files with 13 additions and 11 deletions
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src/analyze.c
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@@ -1599,6 +1599,7 @@ static void initAvgEq(Index *pIdx){
nRow = pIdx->aiRowEst[0];
nDist100 = ((i64)100 * pIdx->aiRowEst[0]) / pIdx->aiRowEst[iCol+1];
}
pIdx->nRowEst0 = nRow;
/* Set nSum to the number of distinct (iCol+1) field prefixes that
** occur in the stat4 table for this index. Set sumEq to the sum of