Changeset: 94f287a5c848 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/94f287a5c848
Modified Files:
gdk/gdk_select.c
Branch: Sep2022
Log Message:
Don't create hash in select on parent bat if too many duplicate values.
diffs (12 lines):
diff --git a/gdk/gdk_select.c b/gdk/gdk_select.c
--- a/gdk/gdk_select.c
+++ b/gdk/gdk_select.c
@@ -1668,6 +1668,8 @@ BATselect(BAT *b, BAT *s, const void *tl
wantphash ||
(pb->batRole == PERSISTENT && GDKinmemory(0))) &&
pbi.count == bi.count &&
+ (pbi.unique_est == 0 ||
+ pbi.unique_est >= pbi.count / no_hash_select_fraction) &&
BAThash(pb) == GDK_SUCCEED) {
MT_rwlock_rdlock(&pb->thashlock);
if (pb->thash)
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