Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Not a Bug
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10.0.10
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None
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None
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None
Description
replace into mysql.http_contents select '/history', (select CONCAT('{"server":"zOBFqxNABETgELkfy0nYH8G+Olk=","history":[', GROUP_CONCAT(COLUMN_JSON(status) separator ',\n') ,'\n]}') from mysql.http_status_history ORDER BY COLUMN_GET(status,'date' as datetime) ), 'text/plain';
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|
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MariaDB [(none)]> show warnings;
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+---------+------+-----------------------------------------------------------------------------+
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| Level | Code | Message |
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+---------+------+-----------------------------------------------------------------------------+
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| Warning | 1301 | Result of concat() was larger than max_allowed_packet (1048576) - truncated |
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+---------+------+-----------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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|
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select * from mysql.http_contents where name="/history";
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+----------+---------+------------+
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| name | content | type |
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+----------+---------+------------+
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| /history | NULL | text/plain |
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+----------+---------+------------+
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1 row in set (0.02 sec)
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MariaDB [(none)]> select CONCAT('{"server":"zOBFqxNABETgELkfy0nYH8G+Olk=","history":[', GROUP_CONCAT(COLUMN_JSON(status) separator ',\n') ,'\n]}') from from mysql.http_status_history ;
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'from mysql.http_status_history' at line 1
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MariaDB [(none)]> select CONCAT('{"server":"zOBFqxNABETgELkfy0nYH8G+Olk=","history":[', GROUP_CONCAT(COLUMN_JSON(status) separator ',\n') ,'\n]}') from mysql.http_status_history ;
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+----------------------------------------------------------------------------------------------------------------------------+
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| CONCAT('{"server":"zOBFqxNABETgELkfy0nYH8G+Olk=","history":[', GROUP_CONCAT(COLUMN_JSON(status) separator ',\n') ,'\n]}') |
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+----------------------------------------------------------------------------------------------------------------------------+
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| NULL |
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+----------------------------------------------------------------------------------------------------------------------------+
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1 row in set, 1 warning (0.02 sec)
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This code works fine when max_allowed_packed is increased
Possible issue are :
- max_allowed_packed is not a session variable and can't be easily changed dynamically
- should truncate the result but not return NULL on overflow
- max_allowed_packed is documented to be the query buffer and not the query result buffer.