--source include/have_innodb.inc
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set @@optimizer_use_condition_selectivity=4;
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set @@use_stat_tables=PREFERABLY;
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create table t1 (a int)engine=InnoDB;
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insert into t1 values (1),(1),(2),(3);
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MariaDB [test]> analyze table t1;
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+---------+---------+----------+-----------------------------------------+
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| Table | Op | Msg_type | Msg_text |
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+---------+---------+----------+-----------------------------------------+
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| test.t1 | analyze | status | Engine-independent statistics collected |
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| test.t1 | analyze | status | OK |
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+---------+---------+----------+-----------------------------------------+
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MariaDB [test]> alter table t1 change a b int;
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Query OK, 0 rows affected (0.029 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> analyze table t1;
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+---------+---------+----------+----------------------------------------------------+
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| Table | Op | Msg_type | Msg_text |
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+---------+---------+----------+----------------------------------------------------+
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| test.t1 | analyze | status | Engine-independent statistics collected |
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| test.t1 | analyze | Note | Data truncated for column 'avg_frequency' at row 1 |
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| test.t1 | analyze | status | OK |
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+---------+---------+----------+----------------------------------------------------+
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MariaDB [test]> select * from mysql.column_stats;
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+---------+------------+-------------+-----------+-----------+-------------+------------+---------------+-----------+-----------+-----------+
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| db_name | table_name | column_name | min_value | max_value | nulls_ratio | avg_length | avg_frequency | hist_size | hist_type | histogram |
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+---------+------------+-------------+-----------+-----------+-------------+------------+---------------+-----------+-----------+-----------+
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| test | t1 | b | 1 | 3 | 0.0000 | 4.0000 | 1.3333 | 0 | NULL | NULL |
|
+---------+------------+-------------+-----------+-----------+-------------+------------+---------------+-----------+-----------+-----------+
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1 row in set (0.001 sec)
|
|
The avg_frequency is 1.3333. The behaviour needs to be consistent.
- is part of
-
MDEV-15253
Default optimizer setting changes for MariaDB 10.4
-
-
Closed
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