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init_replica: ERROR 1270 (HY000): Illegal mix of collations

See original GitHub issue

We got the following table:

 CREATE TABLE `channel_attributes` (
  `channel_id` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `attribute_id` bigint(20) NOT NULL,
  `value` varchar(500) CHARACTER SET utf8 NOT NULL DEFAULT 'true',
  PRIMARY KEY (`channel_id`,`attribute_id`),
  KEY `attribute_id` (`attribute_id`),
  CONSTRAINT `channel_attributes_ibfk_2` FOREIGN KEY (`attribute_id`) REFERENCES `channel_attributes_domain` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

This table produces the following issue when running init_replica:

Jul 17 09:46:49: [INFO] - mysql_lib.py (612): copying table channel_attributes
Jul 17 09:46:49: [DEBUG] - mysql_lib.py (615): estimating rows in channel_attributes
Jul 17 09:46:49: [DEBUG] - mysql_lib.py (644): channel_attributes will be copied in 1 slices of 3054105 rows
Jul 17 09:46:49: [DEBUG] - mysql_lib.py (651): Executing query for table channel_attributes
Jul 17 09:46:49: [ERROR] - mysql_lib.py (654): error when pulling data from channel_attributes. sql executed: SELECT REPLACE(CONCAT('"',CONCAT_WS('","',COALESCE(REPLACE(`channel_id`, '"', '""'),'NULL') ,COALESCE(REPLACE(`attribute_id`, '"', '""'),'NULL') ,COALESCE(REPLACE(`value`, '"', '""'),'NULL') ),'"'),'"NULL"','NULL') as data FROM channel_attributes;
Jul 17 09:46:49: [DEBUG] - mysql_lib.py (656): Starting extraction loop for table channel_attributes
Jul 17 09:46:49: [INFO] - mysql_lib.py (692): the table channel_attributes does not exist

running the sql manually shows the following extra error:

mysql> SELECT REPLACE(CONCAT('"',CONCAT_WS('","',COALESCE(REPLACE(`channel_id`, '"', '""'),'NULL') ,COALESCE(REPLACE(`attribute_id`, '"', '""'),'NULL') ,COALESCE(REPLACE(`value`, '"', '""'),'NULL') ),'"'),'"NULL"','NULL') as data FROM channel_attributes;
ERROR 1270 (HY000): Illegal mix of collations (utf8_bin,NONE), (utf8_general_ci,COERCIBLE), (utf8_general_ci,COERCIBLE) for operation 'replace'

The issue is primarily with the value column - removing it from the sql and it works.