MonetDB: balanced_union - Prune munion members only if it's not ref

[stefanos mavros via checkin-list]

Changeset: 9fe2224d5195 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/9fe2224d5195
Modified Files:
        sql/server/rel_statistics.c
Branch: balanced_union
Log Message:

Prune munion members only if it's not ref


diffs (12 lines):

diff --git a/sql/server/rel_statistics.c b/sql/server/rel_statistics.c
--- a/sql/server/rel_statistics.c
+++ b/sql/server/rel_statistics.c
@@ -893,7 +893,7 @@ rel_get_statistics_(visitor *v, sql_rel 
                for (node *n = rel->exps->h ; n ; n = n->next, i++)
                        rel_munion_get_statistics(v->sql, rel, nrels, n->data, 
i);
 
-               if (needs_pruning) {
+               if (needs_pruning && !rel_is_ref(rel)) {
                        v->changes++;
                        list *nl = sa_list(l->sa);
 
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