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MDEV-334: Backport of UNION ALL optimization from mysql-5.7.

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Although the original code of mysql-5.7 was adjusted
to the current MariaDB code the main ideas of the optimization
were preserved.
This commit is contained in:
Igor Babaev
2014-10-14 09:36:50 -07:00
parent fec5ab5a56
commit 3c4bb0e872
31 changed files with 853 additions and 327 deletions
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2
mysql-test/r/subselect_no_exists_to_in.result
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@ -1056,6 +1056,8 @@ create table t1 (a float);
select 10.5 IN (SELECT * from t1 LIMIT 1);
ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
select 10.5 IN (SELECT * from t1 LIMIT 1 UNION SELECT 1.5);
ERROR HY000: Incorrect usage of UNION and LIMIT
select 10.5 IN (SELECT * from t1 UNION SELECT 1.5 LIMIT 1);
ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
drop table t1;
create table t1 (a int, b int, c varchar(10));