mysql> SET SESSION group_concat_max_len = 134217728;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT GROUP_CONCAT(group_id SEPARATOR '::') from groups where is_public = 0 AND group_id > 100 AND status = 'A';
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| GROUP_CONCAT(group_id SEPARATOR '::')                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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|
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1 row in set (0.00 sec)

mysql> SHOW warnings;
Empty set (0.00 sec)