[MDEV-11468] JSON_UNQUOTE returns incorrect results - Jira

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Compare:

MariaDB 10.2
MariaDB [test]> SELECT JSON_UNQUOTE('foo');
+---------------------+
\| JSON_UNQUOTE('foo') \|
+---------------------+
\| NULL \|
+---------------------+
1 row in set (0.00 sec)

MySQL 5.7
MySQL [test]> SELECT JSON_UNQUOTE('foo');
+---------------------+
\| JSON_UNQUOTE('foo') \|
+---------------------+
\| foo \|
+---------------------+
1 row in set (0.00 sec)

Note: MySQL might be not quite right about it either, as it's supposed to throw an error if the parameter is not a valid JSON document.

relates to

MDEV-9143 JSON_xxx functions

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