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Fix index pages estimation

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Julien Rouhaud 2015-03-17 00:31:44 +01:00
parent 35ffeb4852
commit ba391ca500
1 changed files with 3 additions and 2 deletions
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5
pg_hypo.c
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@ -332,9 +332,10 @@ addHypotheticalIndex(PlannerInfo *root,
if (index->indpred == NIL)
{
/* very quick and pessimistic estimation :
* number of tuples * avg width, with ~ 50% bloat, plus 1 block
* number of tuples * avg width,
* with ~ 50% bloat (including 10% fillfactor), plus 1 block
*/
index->pages = (rel->tuples * ind_avg_width * .5 / BLCKSZ) + 1;
index->pages = (rel->tuples * ind_avg_width * 2 / BLCKSZ) + 1;
/* partial index not supported yet, so assume all tuples are in the index */
index->tuples = rel->tuples;
}