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| author | unknown <igor@rurik.mysql.com> | 2006-05-02 18:31:20 -0700 |
|---|---|---|
| committer | unknown <igor@rurik.mysql.com> | 2006-05-02 18:31:20 -0700 |
| commit | 21d61c2be79681e12ad31162885a43db70021ea5 (patch) | |
| tree | 79f6a11fbe1d4360fbd0457d9546888bd5a4d89c /mysql-test/r/delete.result | |
| parent | 6692dcf7185518743d9dabefd22ef569d90667e6 (diff) | |
| download | mariadb-git-21d61c2be79681e12ad31162885a43db70021ea5.tar.gz | |
Fixed bug #14292: performance degradation for a benchmark query.
This performance degradation was due to the fact that some
cost evaluation code added into 4.1 in the function find_best was
not merged into the code of the function best_access_path added
together with other code for greedy optimizer.
Added a parameter to the function print_plan. The parameter contains
accumulated cost for a given partial join.
The patch does not include a special test case since this performance
degradation is hard to reproduse with a simple example.
TODO: make the function find_best use the function best_access_path
in order to remove duplication of code which might result in incomplete
merges in the future.
mysql-test/r/delete.result:
Fixed bug #14292: performance degradation for a benchmark query.
Adjusted test results.
mysql-test/r/subselect.result:
Fixed bug #14292: performance degradation for a benchmark query.
Adjusted test results.
sql/mysql_priv.h:
Fixed bug #14292: performance degradation for a benchmark query.
Added a parameter to the function print_plan. The parameter contains
accumulated cost for a given partial join.
sql/sql_select.cc:
Fixed bug #14292: performance degradation for a benchmark query.
This performance degradation was due to the fact that some
cost evaluation code added into 4.1 in the function find_best was
not merged into the code of the function best_access_path added
together with other code for greedy optimizer.
sql/sql_test.cc:
Fixed bug #14292: performance degradation for a benchmark query.
Added a parameter to the function print_plan. The parameter contains
accumulated cost for a given partial join.
Diffstat (limited to 'mysql-test/r/delete.result')
| -rw-r--r-- | mysql-test/r/delete.result | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mysql-test/r/delete.result b/mysql-test/r/delete.result index ddfeeac77b5..05f1c967e77 100644 --- a/mysql-test/r/delete.result +++ b/mysql-test/r/delete.result @@ -186,8 +186,8 @@ a b a b a b explain select * from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 -1 SIMPLE t2 index PRIMARY PRIMARY 8 NULL 3 Using where; Using index -1 SIMPLE t3 index PRIMARY PRIMARY 8 NULL 3 Using where; Using index +1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.b,test.t1.b 1 Using index delete t2.*,t3.* from t1,t2,t3 where t1.a=t2.a AND t2.b=t3.a and t1.b=t3.b; select * from t3; a b |