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Make sure the estLog() routine in the query planner handles negative

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values correctly (always returning 1).  Prior to this change, estLog(-1)
would return a large number which could throw off the cost computations
in the query planner in obscure circumstances.

FossilOrigin-Name: 75437bee4905949c66dc7694ea234d4d5aefd981
This commit is contained in:
drh
2014-06-06 20:20:09 +00:00
parent 94aa7e091b
commit c94b2f7d6b
3 changed files with 8 additions and 8 deletions
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2
src/where.c
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@@ -1494,7 +1494,7 @@ static int isDistinctRedundant(
** Estimate the logarithm of the input value to base 2.
*/
static LogEst estLog(LogEst N){
LogEst x = sqlite3LogEst(N);
LogEst x = N<0 ? 1 : sqlite3LogEst(N);
return x>33 ? x - 33 : 0;
}