explain SELECT c_custkey, c_name AS currency2 FROM partsupp LEFT JOIN part ON (
p_partkey = ps_partkey ) JOIN supplier ON (s_suppkey = ps_suppkey) JOIN lineite
m ON ( ps_suppkey = l_suppkey ) JOIN orders ON ( l_orderkey = o_orderkey ) JOIN
customer ON ( o_custkey = c_custkey ) HAVING c_custkey > 150;
In 11.0 shows the table 'part' which should have been eliminated.
This also causes a small degradation in performance.
- is part of
-
MDEV-26974
Improve selectivity and related costs in optimizer
-
-
Closed
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Bug
Major
Some tables where not eliminated when they could have been.
This was caused because HA_KEYREAD_ONLY is not set anymore for InnoDB
clustered index and the elimination code was depending on
field->part_of_key_not_clustered which was not set if HA_KEYREAD_ONLY
is not present.
Fixed by moving out field->part_of_key and
field->part_of_key_not_clustered from under HA_KEYREAD_ONLY (which
they should never have been part of).
The fix exposes issues in extended key code, which took a long time to understand and fix.
The exposed bugs where fixed in another commit