diff options
Diffstat (limited to 'src/backend/utils/adt/selfuncs.c')
| -rw-r--r-- | src/backend/utils/adt/selfuncs.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c index 77ef33b8783..724503e9c4c 100644 --- a/src/backend/utils/adt/selfuncs.c +++ b/src/backend/utils/adt/selfuncs.c @@ -15,7 +15,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.138 2003/05/26 00:11:27 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.139 2003/05/28 16:03:59 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -3905,14 +3905,13 @@ btcostestimate(PG_FUNCTION_ARGS) indexSelectivity, indexCorrelation); /* - * If it's a functional index, leave the default zero-correlation - * estimate in place. If not, and if we can get an estimate for the - * first variable's ordering correlation C from pg_statistic, estimate + * If the first column is a simple variable, and we can get an estimate + * for its ordering correlation C from pg_statistic, estimate * the index correlation as C / number-of-columns. (The idea here is * that multiple columns dilute the importance of the first column's * ordering, but don't negate it entirely.) */ - if (index->indproc == InvalidOid) + if (index->indexkeys[0] != 0) { Oid relid; HeapTuple tuple; @@ -3942,8 +3941,7 @@ btcostestimate(PG_FUNCTION_ARGS) Assert(nnumbers == 1); varCorrelation = numbers[0]; - for (nKeys = 1; index->indexkeys[nKeys] != 0; nKeys++) - /* skip */ ; + nKeys = index->ncolumns; *indexCorrelation = varCorrelation / nKeys; |