From: Tom Lane Date: Sat, 19 Jul 2025 18:23:02 +0000 (-0400) Subject: Mostly-cosmetic adjustments to estimate_multivariate_bucketsize(). X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=aadf7db66ef5a8a723eb3362e2c8b460738f1107;p=thirdparty%2Fpostgresql.git Mostly-cosmetic adjustments to estimate_multivariate_bucketsize(). The only practical effect of these changes is to avoid a useless list_copy() operation when there is a single hashclause. That's never going to make any noticeable performance difference, but the code is arguably clearer this way, especially if we take the opportunity to add some comments so that readers don't have to reverse-engineer the usage of these local variables. Also add some braces for better/more consistent style. Author: Tender Wang Reviewed-by: Tom Lane Discussion: https://postgr.es/m/CAHewXNnHBOO9NEa=NBDYOrwZL4oHu2NOcTYvqyNyWEswo8f5OQ@mail.gmail.com --- diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c index ce6a626eba2..17fbfa9b410 100644 --- a/src/backend/utils/adt/selfuncs.c +++ b/src/backend/utils/adt/selfuncs.c @@ -3798,18 +3798,25 @@ estimate_multivariate_bucketsize(PlannerInfo *root, RelOptInfo *inner, List *hashclauses, Selectivity *innerbucketsize) { - List *clauses = list_copy(hashclauses); - List *otherclauses = NIL; - double ndistinct = 1.0; + List *clauses; + List *otherclauses; + double ndistinct; if (list_length(hashclauses) <= 1) - + { /* * Nothing to do for a single clause. Could we employ univariate * extended stat here? */ return hashclauses; + } + /* "clauses" is the list of hashclauses we've not dealt with yet */ + clauses = list_copy(hashclauses); + /* "otherclauses" holds clauses we are going to return to caller */ + otherclauses = NIL; + /* current estimate of ndistinct */ + ndistinct = 1.0; while (clauses != NIL) { ListCell *lc; @@ -3874,12 +3881,13 @@ estimate_multivariate_bucketsize(PlannerInfo *root, RelOptInfo *inner, group_rel = root->simple_rel_array[relid]; } else if (group_relid != relid) - + { /* * Being in the group forming state we don't need other * clauses. */ continue; + } /* * We're going to add the new clause to the varinfos list. We