Changeset: 49762f4a0fe6 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/49762f4a0fe6
Modified Files:
sql/backends/monet5/bin_partition_by_slice.c
Branch: default
Log Message:
use crude correlated weight
diffs (37 lines):
diff --git a/sql/backends/monet5/bin_partition_by_slice.c
b/sql/backends/monet5/bin_partition_by_slice.c
--- a/sql/backends/monet5/bin_partition_by_slice.c
+++ b/sql/backends/monet5/bin_partition_by_slice.c
@@ -348,12 +348,14 @@ rel_groupby_prepare_pp(list **aggrresult
return NULL;
append(*serializedresults, s);
}
+ dbl corr_weight= 0.85;
for(node *n = gbexps->h; n; n = n->next ) {
sql_exp *e = n->data;
sql_subtype *t = exp_subtype(e);
/* ext */
lng ncard = exp_getcard(be->mvc, rel, e);
- card *= ncard;
+ card *= ncard * corr_weight;
+ corr_weight *= 0.85;
if (card > estimate || ncard >= estimate)
card = estimate;
@@ -840,6 +842,7 @@ rel_groupby_partition(mvc *sql, sql_rel
BUN est = get_rel_count(rel->l);
lng estimate, card = 1;
+ dbl corr_weight= 0.85;
if (est == BUN_NONE
#if SIZEOF_BUN == SIZEOF_LNG
|| (ulng) est > (ulng) GDK_lng_max
@@ -853,7 +856,8 @@ rel_groupby_partition(mvc *sql, sql_rel
for( node *n = l->h; n; n = n->next ) {
sql_exp *e = n->data;
lng ncard = exp_getcard(sql, rel, e);
- card *= ncard; /* TODO check for overflow */
+ card *= ncard * corr_weight; /* TODO check for overflow
*/
+ corr_weight *= 0.85;
if (card > estimate || ncard >= estimate) {
card = estimate;
break;
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