Changeset: ae4d897b9c50 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/ae4d897b9c50
Modified Files:
sql/server/rel_statistics.c
Branch: properties
Log Message:
This estimation is wrong. Remove it
diffs (32 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
@@ -609,7 +609,7 @@ rel_get_statistics_(visitor *v, sql_rel
{
/* Don't prune updates as pruning will possibly result in removing the
joins which therefore cannot be used for constraint checking */
uint8_t has_special_modify = *(uint8_t*) v->data;
- prop *p, *p2;
+ prop *p;
bool can_be_pruned = !has_special_modify && v->storage_based_opt;
/* Don't look at the same relation twice */
@@ -762,19 +762,6 @@ rel_get_statistics_(visitor *v, sql_rel
uniques_estimate = MIN(uniques_estimate, ncount);
}
}
- if ((p = find_prop(el->p,
PROP_NUNIQUES)) && (p2 = find_prop(er->p, PROP_NUNIQUES))) {
- BUN pv = (BUN)
p->value.dval, pv2 = (BUN) p2->value.dval,
- mul = (pv == 0
|| pv2 == 0) ? 0 : ((pv2 > (BUN_MAX / pv)) ? BUN_MAX : (pv * pv2)); /* check
for overflows */
-
- if (is_left(rel->op))
- mul = MAX(mul,
lv);
- else if
(is_right(rel->op))
- mul = MAX(mul,
rv);
- else if
(is_full(rel->op))
- mul =
MAX(MAX(mul, lv), rv);
-
- uniques_estimate =
MIN(uniques_estimate, mul);
- }
}
}
}
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