diff options
| author | unknown <igor@olga.mysql.com> | 2007-08-02 12:45:56 -0700 |
|---|---|---|
| committer | unknown <igor@olga.mysql.com> | 2007-08-02 12:45:56 -0700 |
| commit | c90493749aa8736c76b5765cda0ca925864bbe37 (patch) | |
| tree | cb69ff6598e568046e57c591baf10d4a49f2d5b7 /mysql-test/r/select_found.result | |
| parent | baf24e69daf32141dda59b6d7fe817cc688b9f88 (diff) | |
| download | mariadb-git-c90493749aa8736c76b5765cda0ca925864bbe37.tar.gz | |
Fixed bug#28404.
This patch adds cost estimation for the queries with ORDER BY / GROUP BY
and LIMIT.
If there was a ref/range access to the table whose rows were required
to be ordered in the result set the optimizer always employed this access
though a scan by a different index that was compatible with the required
order could be cheaper to produce the first L rows of the result set.
Now for such queries the optimizer makes a choice between the cheapest
ref/range accesses not compatible with the given order and index scans
compatible with it.
mysql-test/r/distinct.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/endspace.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/group_by.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/group_min_max.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/innodb.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/innodb_mysql.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/merge.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/order_by.result:
Added a test case for bug #28404.
mysql-test/r/select_found.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/r/subselect.result:
Adjusted results for test cases affected fy the fix for bug #28404.
mysql-test/t/distinct.test:
Changed a test case after adding the fix for bug #28404.
mysql-test/t/order_by.test:
Added a test case for bug #28404.
sql/sql_select.cc:
Fixed bug#28404.
This patch adds cost estimation for the queries with ORDER BY / GROUP BY
and LIMIT.
Now for such queries the optimizer makes a choice between the cheapest
ref/range accesses not compatible with the given order and index scans
compatible with it.
Modified the function test_if_skip_sort_order to make the above mentioned
choice cost based.
sql/sql_select.h:
Fixed bug#28404.
This patch adds cost estimation for the queries with ORDER BY / GROUP BY
and LIMIT.
Added a new field fot the JOIN_TAB structure.
Diffstat (limited to 'mysql-test/r/select_found.result')
| -rw-r--r-- | mysql-test/r/select_found.result | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mysql-test/r/select_found.result b/mysql-test/r/select_found.result index 7abd65beb46..7896f8a9f4e 100644 --- a/mysql-test/r/select_found.result +++ b/mysql-test/r/select_found.result @@ -84,7 +84,7 @@ UNIQUE KEY e_n (email,name) EXPLAIN SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system PRIMARY,kid NULL NULL NULL 0 const row not found -1 SIMPLE t2 index NULL e_n 104 NULL 200 +1 SIMPLE t2 index NULL e_n 104 NULL 10 SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10; email email1 |