- Unify EXPLAIN printout for <subqueryN> tables with regular tables
- Update test results for <subqueryN> tables:
s/unique_key/distinct_key/g
s/1.0/100.0/ for "filtered" column
- Change "SUBQUERY#n" to "<subquery{n}>" in EXPLAIN output. We need to it to be
lowercase so that EXPLAIN results do not differ in case between systems with
case-sensitive and case-insensitive filesystems.
- Remove garbage comments, add better comments.
- Code cleanu.
- Make MWL#90 code require @@optimizer_switch='semijoin=on'
- Update test results with the above
- Fork subselect_mat.test - we want to check both semi-join materialization,
which now has broader scope and non-semijoin materialization.
was not cleaned up between PS re-executions. The reason was two-fold:
- a merge with mysql-6.0 missed select_union::cleanup() that should
have cleaned up the temp table, and
- the subclass of select_union used by materialization didn't call
the base class cleanup() method.
- Add Item_in_subselect::get_identifier() that returns subquery's id
- Change select_describe() to produce output in new format
- Update test results (checked)
Bug#48213 Materialized subselect crashes if using GEOMETRY type
The problem occurred because during semi-join a materialized table
was created which contained a GEOMETRY column, which is a specialized
BLOB column. This caused an segmentation fault because such tables will
have extra columns, and the semi-join code was not prepared for that.
The solution is to disable materialization when Blob/Geometry columns would
need to be materialized. Blob columns cannot be used for index look-up
anyway, so it does not makes sense to use materialization.
This fix implies that it is detected earlier that subquery materialization
can not be used. The result of that is that in->exist optimization may
be performed for such queries. Hence, extended query plans for such
queries had to be updated.
mysql-test/r/subselect_mat.result:
Update extended query plan for subqueries that cannot use materialization
due to Blobs.
mysql-test/r/subselect_sj.result:
Updated result file.
mysql-test/r/subselect_sj_jcl6.result:
Update result file.
mysql-test/t/subselect_sj.test:
Add test case for Bug#48213 that verifies that semi-join works when subquery select list contain Blob columns. Also verify that materialization is not
used.
sql/opt_subselect.cc:
Disable materialization for semi-join/subqueries when the subquery select list
contain Blob columns.
BUG#50019: Wrong result for IN-subquery with materialization
- Fix equality substitution in presense of semi-join materialization, lookup and scan variants
(started off from fix by Evgen Potemkin, then modified it to work in all cases)
