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SHOW VARIABLES LIKE "group_concat_max_len";
SET GLOBAL group_concat_max_len=1024000;
SET @@GROUP_CONCAT_MAX_LEN = 1024000;
SHOW VARIABLES LIKE "group_concat_max_len";
SET GLOBAL group_concat_max_len=1024000;
SET @@GROUP_CONCAT_MAX_LEN = 1024000;