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MDEV-27238: Assertion `got_name == named_item_expected()' failed in Json_writer

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make_join_select() calls const_cond->val_int(). There are edge cases
where const_cond may have a not-yet optimized subquery.

(The subquery will have used_tables() covered by join->const_tables. It
will still have const_item()==false, so other parts of the optimizer
will not try to evaluate it.  We should probably mark such subqueries
as constant but that is outside the scope of this MDEV)
This commit is contained in:
Sergei Petrunia
2021-12-23 12:00:05 +03:00
parent 0165a06322
commit 397f5cf71e
3 changed files with 36 additions and 7 deletions
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10
mysql-test/main/opt_trace.test
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@@ -643,6 +643,16 @@ SELECT 'a\0' LIMIT 0;
SELECT query, trace FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SET optimizer_trace=DEFAULT;
--echo #
--echo # MDEV-27238: Assertion `got_name == named_item_expected()' failed in Json_writer::on_start_object
--echo #
CREATE TABLE t1 (a INT KEY,b INT,KEY(b)) ENGINE=MEMORY;
SET optimizer_trace=1;
INSERT INTO t1 VALUES (0,0);
SELECT a FROM t1 WHERE (a,b) in (SELECT @c,@d);
DROP TABLE t1;
--echo #
--echo # End of 10.4 tests
--echo #