mirror of
https://github.com/MariaDB/server.git
synced 2025-01-27 09:14:17 +01:00
727491b72a
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)
399 lines
12 KiB
Text
399 lines
12 KiB
Text
set @old_debug= @@debug_dbug;
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create table t_tmp(a int, b int);
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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insert into t1 values(1);
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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select a , invisible from t1;
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a invisible
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1 9
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insert into t1(a, invisible) values(99,99);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select default(invisible) from t1;
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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insert into t1(invisible) values(99);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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insert into t_tmp select a, invisible from t1;
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insert into t1 select * from t_tmp;
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ERROR 21S01: Column count doesn't match value count at row 1
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insert into t1(a,invisible) select * from t_tmp;
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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1 9
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insert into t1 values (5), (invisible+1);
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select a , invisible from t1;
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a invisible
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1 9
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5 9
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10 9
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delete from t1 where a > 1;
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update t1 set a = invisible where a=1;
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select a , invisible from t1;
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a invisible
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9 9
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update t1 set a = (select invisible+100 from t1 limit 1) where a=(select a from t1 limit 1);
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select a , invisible from t1;
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a invisible
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109 9
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update t1 set invisible = 23 where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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update t1 set invisible = 101 where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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update t1 set invisible = (select invisible+100 from t1 limit 1) where a=(select invisible from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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set @a=12;
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update t1 set invisible = (select @a from dual) where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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update t1 set invisible = (select invisible+100 from t1 limit 1) where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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set @a=(select invisible from t1 limit 1);
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select @a from dual;
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@a
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9
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alter table t1 add constraint a check (invisible > 2);
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ERROR 42S22: Unknown column 'invisible' in 'CHECK'
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t2(a int, b int as (invisible +2) virtual);
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ERROR 42S22: Unknown column 'invisible' in 'GENERATED ALWAYS AS'
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create table t2(a int , b int);
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insert into t2 values(2,2);
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insert into t2 select a, invisible from t1;
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set debug_dbug=@old_debug;
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select * from t1;
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a
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109
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select invisible ,a from t1;
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invisible a
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9 109
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drop table t1,t2,t_tmp;
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set debug_dbug= "+d,test_completely_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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set debug_dbug= "+d,test_completely_invisible";
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select invisible ,a from t1;
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invisible a
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9 1
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set debug_dbug=@old_debug;
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create table t2 (invisible int);
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select * from t1 join t2 using (invisible);
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ERROR 42S22: Unknown column 'invisible' in 'from clause'
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select * from t2 join t1 using (invisible);
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ERROR 42S22: Unknown column 'invisible' in 'from clause'
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insert t2 values (8),(9);
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select * from t1 natural join t2;
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a invisible
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1 8
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1 9
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select * from t2 natural join t1;
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invisible a
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8 1
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9 1
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drop table t1, t2;
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 change invisible b int;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 modify invisible char;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 drop invisible;
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ERROR 42000: Can't DROP COLUMN `invisible`; check that it exists
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible int;
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ERROR 42S21: Duplicate column name 'invisible'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible2 int default 2;
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select * from t1;
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a invisible2
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1 2
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select invisible ,a from t1;
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invisible a
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9 1
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create trigger trg before insert on t1 for each row set new.invisible=1;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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create trigger trg before insert on t1 for each row set @a:=new.invisible;
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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create trigger trg before insert on t1 for each row set new.invisible=1;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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create trigger trg before insert on t1 for each row set @a:=new.invisible;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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set debug_dbug= "+d,test_completely_invisible";
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 change invisible b int;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 modify invisible char;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 drop invisible;
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ERROR 42000: Can't DROP COLUMN `invisible`; check that it exists
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible int;
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select * from t1;
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a invisible
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1 NULL
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select invisible1, invisible ,a from t1;
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invisible1 invisible a
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9 NULL 1
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ALTER table t1 add hid int default 2;
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select * from t1;
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a invisible hid
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1 NULL 2
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select invisible ,a from t1;
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invisible a
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NULL 1
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drop table t1;
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set debug_dbug=@old_debug;
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Create table t1( a int default(99) invisible, b int);
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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alter table t1 add index(a);
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alter table t1 add index(a,b);
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 1 a 1 a A NULL NULL NULL YES BTREE NO
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t1 1 a_2 1 a A NULL NULL NULL YES BTREE NO
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t1 1 a_2 2 b A NULL NULL NULL YES BTREE NO
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drop table t1;
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set debug_dbug= "+d,test_pseudo_invisible";
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Create table t1( a int default(99) invisible, b int);
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Create table t2( a int default(99) invisible, b int, unique(invisible));
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ERROR 42000: Key column 'invisible' doesn't exist in table
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set debug_dbug=@old_debug;
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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select invisible, a, b from t1 order by b;
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invisible a b
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9 99 1
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9 99 2
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9 99 3
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9 99 4
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alter table t1 add index(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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alter table t1 add index(b,invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible";
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Create table t1( a int default(99) invisible, b int);
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Create table t2( a int default(99) invisible, b int, unique(invisible));
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ERROR 42000: Key column 'invisible' doesn't exist in table
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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select invisible, a, b from t1 order by b;
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invisible a b
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9 99 1
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9 99 2
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9 99 3
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9 99 4
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set debug_dbug=@old_debug;
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alter table t1 add index(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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alter table t1 add index(b,invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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Create table t1( a int default(99) , b int,c int, index(b));
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set debug_dbug=@old_debug;
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Show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 1 b 1 b A NULL NULL NULL YES BTREE NO
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select * from INFORMATION_SCHEMA.STATISTICS where TABLE_SCHEMA ='test' and table_name='t1';
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TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT IGNORED
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def test t1 1 test b 1 b A NULL NULL NULL YES BTREE NO
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT 99,
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`b` int(11) DEFAULT NULL,
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`c` int(11) DEFAULT NULL,
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KEY `b` (`b`)
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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insert into t1 values(1,1,1);
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insert into t1 values(2,2,2);
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insert into t1 values(3,3,3);
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insert into t1 values(4,4,4);
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insert into t1 values(5,5,5);
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insert into t1 values(6,6,6);
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insert into t1 values(7,7,7);
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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select invisible, a ,b from t1 order by b;
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invisible a b
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9 1 1
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9 2 2
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9 3 3
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9 4 4
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9 5 5
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9 6 6
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9 7 7
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref invisible invisible 5 const 7
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alter table t1 add x int default 3;
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select invisible, a ,b from t1;
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invisible a b
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9 1 1
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9 2 2
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9 3 3
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9 4 4
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9 5 5
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9 6 6
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9 7 7
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set debug_dbug=@old_debug;
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Show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 1 b 1 b A NULL NULL NULL YES BTREE NO
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create index a1 on t1(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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drop index invisible on t1;
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ERROR 42000: Can't DROP INDEX `invisible`; check that it exists
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref invisible invisible 5 const 7
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create index invisible on t1(c);
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref invisible_2 invisible_2 5 const 7
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show indexes in t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
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t1 1 b 1 b A NULL NULL NULL YES BTREE NO
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t1 1 invisible 1 c A NULL NULL NULL YES BTREE NO
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t1 1 invisible_2 1 invisible A NULL NULL NULL YES BTREE NO
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drop table t1;
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set @old_debug= @@debug_dbug;
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CREATE TABLE t1 (i INT );
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SET debug_dbug="+d,test_completely_invisible,test_invisible_index";
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CREATE TABLE t2 LIKE t1;
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SET debug_dbug= DEFAULT;
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DROP TABLE t1, t2;
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#
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# MDEV-20210
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# If you have an INVISIBLE VIRTUAL column, SHOW CREATE TABLE doesn't list it as INVISIBLE
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#
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CREATE TABLE t1 (i INT, v int GENERATED ALWAYS AS (1) VIRTUAL INVISIBLE);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`i` int(11) DEFAULT NULL,
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`v` int(11) GENERATED ALWAYS AS (1) VIRTUAL INVISIBLE
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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DROP TABLE t1;
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