The mysql type code mapped by the map type is 400, but 400 is an unknown type for mysql.
For the jdbc driver of mariadb, when querying through the http api of /api/query or using the jdbc driver of mariadb, an exception will occur.
For the jdbc driver of mysql, it will be converted into binary form, and the correct data can be read through the string type.
Therefore, the mysql custom type of map was removed and changed to string type, so that both the jdbc driver of mariadb and mysql can work normally.
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