- Set the default
- Adjust the testcases so that 'new' tests are run with optimizations turned on.
- Pull out relevant tests from "irrelevant" tests and run them with optimizations on.
- Run range.test and innodb.test with both mrr=on and mrr=off
semijoin=on,firstmatch=on,loosescan=on
to
semijoin=off,firstmatch=off,loosescan=off
Adjust the testcases:
- Modify subselect*.test and join_cache.test so that all tests
use the same execution paths as before (i.e. optimizations that
are being tested are enabled)
- Let all other test files run with the new default settings (i.e.
with new optimizations disabled)
- Copy subquery testcases from these files into t/subselect_extra.test
which will run them with new optimizations enabled.
'derived_merge':
- if the flag is off then all derived tables are materialized
- if the flag is on then mergeable derived tables are merged
'derived_with_keys':
- if the flag is off then no keys are created for derived tables
- if the flag is on then for any derived table a key to access
the derived table may be created.
Now by default both flags are on.
Later the default values for the flags will be off to comply with
the current behaviour of mysql-5.1.
Uncommented previously commented out test case from parts.partition_repair_myisam
after having added an explicit requirement to materialize the derived
table used in the test case.
When this flag is 'off' the size of the used join buffer
is taken directly from the system variable 'join_buffer_size'.
When this flag is 'on' then the size of the buffer depends
on the estimated number of rows in the partial join whose
records are to be stored in the buffer.
By default this flag is set 'on'.
- Let "mysqld --help --verbose" list all optimizer options
- Make it possible to add new @@optimizer_switch flags w/o causing .result
changes all over the testsuite:
= Remove "select @@optimizer_switch" from tests that do not need all switches
= Move @@optimizer_switch-specific tests to t/optimizer_switch.test
