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Let say I have a table with million of rows.
Does this sql query stop as soon as “group_concat_length” limit value is reached for all “id_list” or does it test all rows in the table?
SELECT GROUP_CONCAT(id) AS id_list, type FROM table WHERE 1 GROUP BY type
All rows and groups are processed
Only an individual aggregation is truncated
http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html