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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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20
mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result
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@ -140,16 +140,6 @@ key_len NULL
ref NULL
rows NULL
Extra No tables used
id NULL
select_type UNION RESULT
table <union2,3>
type ALL
possible_keys NULL
key NULL
key_len NULL
ref NULL
rows NULL
Extra
#
# Demonstrate that the reported SELECT statement
# no longer produces warnings.
@ -344,16 +334,6 @@ key_len NULL
ref NULL
rows NULL
Extra No tables used
id NULL
select_type UNION RESULT
table <union2,3>
type ALL
possible_keys NULL
key NULL
key_len NULL
ref NULL
rows NULL
Extra
# Lock the record.
select 1 from t1 natural join (select 3 as a, 2 as b union all
select 3 as a, 1 as b) as t2 for update;