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author | Monty <monty@mariadb.org> | 2022-10-04 16:16:06 +0300 |
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committer | Monty <monty@mariadb.org> | 2022-12-20 23:11:28 +0200 |
commit | 95bec99dc43d704ab530e879b05535be7a666070 (patch) | |
tree | 9b4752ff535dac0ccaff15778f87aa4480809be0 /mysql-test/suite/archive | |
parent | 891e207aebcefc357f48ae979db79ce029996269 (diff) | |
download | mariadb-git-95bec99dc43d704ab530e879b05535be7a666070.tar.gz |
Added test cases for preceding test
This includes all test changes from
"Changing all cost calculation to be given in milliseconds"
and forwards.
Some of the things that caused changes in the result files:
- As part of fixing tests, I added 'echo' to some comments to be able to
easier find out where things where wrong.
- MATERIALIZED has now a higher cost compared to X than before. Because
of this some MATERIALIZED types have changed to DEPENDEND SUBQUERY.
- Some test cases that required MATERIALIZED to repeat a bug was
changed by adding more rows to force MATERIALIZED to happen.
- 'Filtered' in SHOW EXPLAIN has in many case changed from 100.00 to
something smaller. This is because now filtered also takes into
account the smallest possible ref access and filters, even if they
where not used. Another reason for 'Filtered' being smaller is that
we now also take into account implicit filtering done for subqueries
using FIRSTMATCH.
(main.subselect_no_exists_to_in)
This is caluculated in best_access_path() and stored in records_out.
- Table orders has changed because more accurate costs.
- 'index' and 'ALL' for small tables has changed to use 'range' or
'ref' because of optimizer_scan_setup_cost.
- index can be changed to 'range' as 'range' optimizer assumes we don't
have to read the blocks from disk that range optimizer has already read.
This can be confusing in the case where there is no obvious where clause
but instead there is a hidden 'key_column > NULL' added by the optimizer.
(main.subselect_no_exists_to_in)
- Scan on primary clustered key does not report 'Using Index' anymore
(It's a table scan, not an index scan).
- For derived tables, the number of rows is now 100 instead of 2,
which can be seen in EXPLAIN.
- More tests have "Using index for group by" as the cost of this
optimization is now more correct (lower).
- A primary key could be preferred for a normal key, even if it would
access more rows, as it's faster to do 1 lokoup and 3 'index_next' on a
clustered primary key than one lookup trough a secondary.
(main.stat_tables_innodb)
Notes:
- There was a 4.7% more calls to best_extension_by_limited_search() in
the main.greedy_optimizer test. However examining the test results
it looked that the plans where slightly better (eq_ref where more
chained together) so I assume this is ok.
- I have verified a few test cases where there was notable/unexpected
changes in the plan and in all cases the new optimizer plans where
faster. (main.greedy_optimizer and some others)
Diffstat (limited to 'mysql-test/suite/archive')
-rw-r--r-- | mysql-test/suite/archive/archive.result | 4 | ||||
-rw-r--r-- | mysql-test/suite/archive/archive.test | 3 |
2 files changed, 6 insertions, 1 deletions
diff --git a/mysql-test/suite/archive/archive.result b/mysql-test/suite/archive/archive.result index 022b400fd97..0a6ec04fb31 100644 --- a/mysql-test/suite/archive/archive.result +++ b/mysql-test/suite/archive/archive.result @@ -12488,6 +12488,10 @@ SELECT b FROM t5 WHERE a =3; b in order to form a more pefect union foo this is mine to think about +explain +SELECT b FROM t5 WHERE a IN (32, 23, 5); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t5 ALL a NULL NULL NULL 11 Using where SELECT b FROM t5 WHERE a IN (32, 23, 5); b foo grok diff --git a/mysql-test/suite/archive/archive.test b/mysql-test/suite/archive/archive.test index b6920827005..df5f6503321 100644 --- a/mysql-test/suite/archive/archive.test +++ b/mysql-test/suite/archive/archive.test @@ -1445,8 +1445,9 @@ INSERT INTO t5 VALUES (NULL, "promote the general welfare"); SELECT * FROM t5; SELECT b FROM t5; SELECT b FROM t5 WHERE a =3; +explain +SELECT b FROM t5 WHERE a IN (32, 23, 5); SELECT b FROM t5 WHERE a IN (32, 23, 5); - #More blob tests |