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| author | Sergey Glukhov <Sergey.Glukhov@sun.com> | 2010-03-24 14:37:28 +0400 |
|---|---|---|
| committer | Sergey Glukhov <Sergey.Glukhov@sun.com> | 2010-03-24 14:37:28 +0400 |
| commit | bccf219bfc61bb45d334b40d732651eb9bef5075 (patch) | |
| tree | c59f93c73cda6e6b70f8b140a8ce67e81dc34aca /mysql-test/r/join.result | |
| parent | 2a667b7bcbd8be59f9eb04fe6d3d6d4099baa2c2 (diff) | |
| download | mariadb-git-bccf219bfc61bb45d334b40d732651eb9bef5075.tar.gz | |
Bug#48483 crash in get_best_combination()
The crash happens because greedy_serach
can not determine best plan due to
wrong inner table dependences. These
dependences affects join table sorting
which performs before greedy_search starting.
In our case table which has real 'no dependences'
should be put on top of the list but it does not
happen as inner tables have no dependences as well.
The fix is to exclude RAND_TABLE_BIT mask from
condition which checks if table dependences
should be updated.
mysql-test/r/join.result:
test result
mysql-test/t/join.test:
test case
sql/sql_select.cc:
RAND_TABLE_BIT mask should not be counted as it
prevents update of inner table dependences.
For example it might happen if RAND() function
is used in JOIN ON clause.
Diffstat (limited to 'mysql-test/r/join.result')
| -rw-r--r-- | mysql-test/r/join.result | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mysql-test/r/join.result b/mysql-test/r/join.result index 7d6ef5b40ba..bacfa81160a 100644 --- a/mysql-test/r/join.result +++ b/mysql-test/r/join.result @@ -913,4 +913,21 @@ ON t4.a = t5.a ON t1.a = t3.a; a a a a a a DROP TABLE t1,t2,t3,t4,t5,t6; +# +# Bug#48483: crash in get_best_combination() +# +CREATE TABLE t1(f1 INT); +INSERT INTO t1 VALUES (1),(2); +CREATE VIEW v1 AS SELECT 1 FROM t1 LEFT JOIN t1 AS t2 on 1=1; +EXPLAIN EXTENDED +SELECT 1 FROM v1 right join v1 AS v2 ON RAND(); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 2 +1 SIMPLE t2 ALL NULL NULL NULL NULL 2 +1 SIMPLE t1 ALL NULL NULL NULL NULL 2 +1 SIMPLE t2 ALL NULL NULL NULL NULL 2 +Warnings: +Note 1003 select 1 AS `1` from `test`.`t1` left join `test`.`t1` `t2` on((1 = 1)) left join (`test`.`t1` left join `test`.`t1` `t2` on((1 = 1))) on(rand()) where 1 +DROP VIEW v1; +DROP TABLE t1; End of 5.0 tests. |