diff options
| author | Sergey Petrunya <psergey@askmonty.org> | 2014-10-29 01:20:45 +0300 |
|---|---|---|
| committer | Sergey Petrunya <psergey@askmonty.org> | 2014-10-29 01:20:45 +0300 |
| commit | 94c8f33569ec2b8094928463150567d4dcf67398 (patch) | |
| tree | 5593e8272c103e29142a401d292a079c9886ed25 /mysql-test/r/join_cache.result | |
| parent | 5023bb899dfaf78d85be2e6c08ec22cadcbcf82a (diff) | |
| download | mariadb-git-94c8f33569ec2b8094928463150567d4dcf67398.tar.gz | |
MDEV-6888: Query spends a long time in best_extension_by_limited_search with mrr enabled
- TABLE::create_key_part_by_field() should not set PART_KEY_FLAG in field->flags
= The reason is that it is used by hash join code which calls it to create a hash
table lookup structure. It doesn't create a real index.
= Another caller of the function is TABLE::add_tmp_key(). Made it to set the flag itself.
- The differences in join_cache.result could also be observed before this patch: one
could put "FLUSH TABLES" before the queries and get exactly the same difference.
Diffstat (limited to 'mysql-test/r/join_cache.result')
| -rw-r--r-- | mysql-test/r/join_cache.result | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/mysql-test/r/join_cache.result b/mysql-test/r/join_cache.result index be1086b1afc..1f2ae4a9e5a 100644 --- a/mysql-test/r/join_cache.result +++ b/mysql-test/r/join_cache.result @@ -498,8 +498,8 @@ CountryLanguage.Percentage > 50 AND LENGTH(Language) < LENGTH(City.Name) - 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) 1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) +1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) SELECT City.Name, Country.Name, CountryLanguage.Language FROM City,Country,CountryLanguage WHERE City.Country=Country.Code AND @@ -576,8 +576,8 @@ CountryLanguage.Percentage > 50 AND LENGTH(Language) < LENGTH(City.Name) - 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (incremental, BNL join) +1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) +1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join) SELECT City.Name, Country.Name, CountryLanguage.Language FROM City,Country,CountryLanguage WHERE City.Country=Country.Code AND @@ -654,8 +654,8 @@ CountryLanguage.Percentage > 50 AND LENGTH(Language) < LENGTH(City.Name) - 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) 1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) +1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) SELECT City.Name, Country.Name, CountryLanguage.Language FROM City,Country,CountryLanguage WHERE City.Country=Country.Code AND @@ -732,8 +732,8 @@ CountryLanguage.Percentage > 50 AND LENGTH(Language) < LENGTH(City.Name) - 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (incremental, BNLH join) +1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) +1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join) SELECT City.Name, Country.Name, CountryLanguage.Language FROM City,Country,CountryLanguage WHERE City.Country=Country.Code AND |