Details
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Bug
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Status: Stalled (View Workflow)
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Minor
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Resolution: Unresolved
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10.0(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL)
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None
Description
--source include/have_innodb.inc
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set @@optimizer_use_condition_selectivity=4; |
set @@use_stat_tables=PREFERABLY; |
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create table t1 (a int)engine=InnoDB; |
insert into t1 values (1),(1),(2),(3); |
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MariaDB [test]> analyze table t1; |
+---------+---------+----------+-----------------------------------------+ |
| Table | Op | Msg_type | Msg_text | |
+---------+---------+----------+-----------------------------------------+ |
| test.t1 | analyze | status | Engine-independent statistics collected | |
| test.t1 | analyze | status | OK |
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+---------+---------+----------+-----------------------------------------+ |
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alter table t1 change a b int; |
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MariaDB [test]> analyze table t1; |
+---------+---------+----------+----------------------------------------------------+ |
| Table | Op | Msg_type | Msg_text | |
+---------+---------+----------+----------------------------------------------------+ |
| test.t1 | analyze | status | Engine-independent statistics collected | |
| test.t1 | analyze | Note | Data truncated for column 'avg_frequency' at row 1 | |
| test.t1 | analyze | status | OK |
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+---------+---------+----------+----------------------------------------------------+ |
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select * from mysql.column_stats; |
drop table t1; |
So here we see a truncation that happens due
rounding off (we should suppress this because the user doesn't expects this)
But we should be throwing a warning if we have an overflow.
The current situations is like for ANALYZE command we don't make a choice if we want to throw a warning on truncation or not. The above case happens due to the bug MDEV-17778. So this MDEV is about making the choice as to if we want to throw warning or errors for truncation or overflow while calculating the statistics
Attachments
Issue Links
- is part of
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MDEV-15253 Default optimizer setting changes for MariaDB 10.4
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- Closed
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As discussed with psergey, reducing the priority of this issue