Changeset: 8621e269b67b for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=8621e269b67b
Modified Files:
sql/server/rel_optimizer.c
Branch: Jun2020
Log Message:
Reverting my own changes, running rel_merge_rse optimizer more than once,
causes performance degradation
diffs (13 lines):
diff --git a/sql/server/rel_optimizer.c b/sql/server/rel_optimizer.c
--- a/sql/server/rel_optimizer.c
+++ b/sql/server/rel_optimizer.c
@@ -9122,7 +9122,8 @@ optimize_rel(mvc *sql, sql_rel *rel, int
rel = rel_visitor_topdown(sql, rel, &rel_split_outerjoin,
&changes);
if (gp.cnt[op_select] || gp.cnt[op_project])
- rel = rel_visitor_bottomup(sql, rel, &rel_merge_rse, &changes);
+ if (level == 1) /* only once */
+ rel = rel_visitor_bottomup(sql, rel, &rel_merge_rse,
&changes);
if (gp.cnt[op_select] && gp.cnt[op_join] && /* DISABLES CODE */ (0))
rel = rel_visitor_topdown(sql, rel, &rel_push_select_down_join,
&changes);
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