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| author | Igor Babaev <igor@askmonty.org> | 2016-02-09 12:35:59 -0800 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2016-02-09 12:35:59 -0800 |
| commit | 2cfc450bf78c2d951729d1a0e8f731c0d987b1d5 (patch) | |
| tree | 6c15f411927c9da723265d5f9891592390e97cea /mysql-test/r/myisam.result | |
| parent | 7b50447aa6d051b8d14bb01ef14802cb8ffee223 (diff) | |
| download | mariadb-git-2cfc450bf78c2d951729d1a0e8f731c0d987b1d5.tar.gz | |
This is the consolidated patch for mdev-8646:bb-10.2-mdev8646
"Re-factor the code for post-join operations".
The patch mainly contains the code ported from mysql-5.6 and
created for two essential architectural changes:
1. WL#5558: Resolve ORDER BY execution method at the optimization stage
2. WL#6071: Inline tmp tables into the nested loops algorithm
The first task was implemented for mysql-5.6 by Ole John Aske.
It allows to make all decisions on ORDER BY operation at the optimization
stage.
The second task implemented for mysql-5.6 by Evgeny Potemkin adds JOIN_TAB
nodes for post-join operations that require temporary tables. It allows
to execute these operations within the nested loops algorithm that used to
be used before this task only for join queries. Besides these task moves
all planning on the execution of these operations from the execution phase
to the optimization phase.
Some other re-factoring changes of mysql-5.6 were pulled in, mainly because
it was easier to pull them in than roll them back. In particular all
changes concerning Ref_ptr_array were incorporated.
The port required some changes in the MariaDB code that concerned the
functionality of EXPLAIN and ANALYZE. This was done mainly by Sergey
Petrunia.
Diffstat (limited to 'mysql-test/r/myisam.result')
| -rw-r--r-- | mysql-test/r/myisam.result | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mysql-test/r/myisam.result b/mysql-test/r/myisam.result index 093de1339f3..59f3a6fc5cc 100644 --- a/mysql-test/r/myisam.result +++ b/mysql-test/r/myisam.result @@ -523,11 +523,11 @@ a explain select sql_big_result distinct t1.a from t1,t2 order by t2.a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 Using temporary -1 SIMPLE t2 index NULL PRIMARY 4 NULL 2 Using index; Distinct +1 SIMPLE t2 index NULL PRIMARY 4 NULL 2 Using index explain select distinct t1.a from t1,t2 order by t2.a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 Using temporary -1 SIMPLE t2 index NULL PRIMARY 4 NULL 2 Using index; Distinct +1 SIMPLE t2 index NULL PRIMARY 4 NULL 2 Using index drop table t1,t2; create table t1 ( c1 varchar(32), |