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MDEV-30693: Assertion `dbl_records <= s->records' failed in apply_selectivity_for_table on SELECT

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The crash happened due to rows=2 vs rows=1 difference between how the
estimate of number of rows in a derived table is computed in
TABLE_LIST::fetch_number_of_rows() and JOIN::add_keyuses_for_splitting().

Made JOIN::add_keyuses_for_splitting() use the result of computations in
TABLE_LIST::fetch_number_of_rows().
This commit is contained in:
Sergei Petrunia
2023-02-22 12:11:55 +03:00
parent 1310b3a02f
commit ef5bb0814a
3 changed files with 24 additions and 1 deletions
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9
mysql-test/main/selectivity_innodb.test
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@ -282,6 +282,15 @@ SELECT b FROM t WHERE a > 'a' GROUP BY b HAVING b >= 6 OR b <= 0;
# Cleanup
DROP TABLE t;
--echo #
--echo # MDEV-30693: Assertion `dbl_records <= s->records' failed in apply_selectivity_for_table on SELECT
--echo #
set @tmp_oucs= @@optimizer_use_condition_selectivity;
CREATE TABLE t1 (c INT KEY) ENGINE=InnoDB;
SELECT * FROM (SELECT * FROM t1) a JOIN (SELECT * FROM (SELECT * FROM t1 GROUP BY c) d WHERE c>1) b ON a.c=b.c;
DROP TABLE t1;
SET optimizer_use_condition_selectivity=1;
--echo #
--echo # End of 11.0 tests
--echo #