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MariaDB does have a JSON data type implemented, with a lot of features added over time, but unlike MySQL 8.0.x it does not support casting to JSON (since MDEV-11439 is fixed, probably). Consider this:
openxs@ao756:~/dbs/8.0$ bin/mysql --socket=/tmp/maysql8.sock -uroot
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Welcome to the MySQL monitor. Commands end with ; or \g.
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Your MySQL connection id is 9
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Server version: 8.0.26 Source distribution
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Copyright (c) 2000, 2021, Oracle and/or its affiliates.
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Oracle is a registered trademark of Oracle Corporation and/or its
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affiliates. Other names may be trademarks of their respective
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owners.
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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mysql> select cast(true as json);
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+--------------------+
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| cast(true as json) |
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+--------------------+
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| true |
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+--------------------+
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1 row in set (0,00 sec)
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and compare to the following MariaDB behavior:
openxs@ao756:~/dbs/8.0$ bin/mysql --socket=/tmp/mariadb.sock
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Welcome to the MySQL monitor. Commands end with ; or \g.
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Your MySQL connection id is 6
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Server version: 5.5.5-10.6.5-MariaDB MariaDB Server
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Copyright (c) 2000, 2021, Oracle and/or its affiliates.
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Oracle is a registered trademark of Oracle Corporation and/or its
|
affiliates. Other names may be trademarks of their respective
|
owners.
|
|
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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mysql> select cast(true as json);
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'json)' at line 1
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mysql> select cast(true as text);
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'text)' at line 1
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mysql> select cast(true as unsigned);
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+------------------------+
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| cast(true as unsigned) |
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+------------------------+
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| 1 |
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+------------------------+
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1 row in set (0,00 sec)
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mysql> select cast(true as char);
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+--------------------+
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| cast(true as char) |
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+--------------------+
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| 1 |
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+--------------------+
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1 row in set (0,00 sec)
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It is unexpected I'd say to have no way to cast to JSON (or, for that matter, TEXT) type when cast to CHAR is supported.
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