[MDEV-11573] JSON_LENGTH returns incorrect results - Jira

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MariaDB 10.2
MariaDB [test]> SELECT JSON_LENGTH('{"a": 1, "b": {"c": 30}}');
+-----------------------------------------+
\| JSON_LENGTH('{"a": 1, "b": {"c": 30}}') \|
+-----------------------------------------+
\| 0 \|
+-----------------------------------------+
1 row in set (0.00 sec)

MySQL 5.7
MySQL [test]> SELECT JSON_LENGTH('{"a": 1, "b": {"c": 30}}');
+-----------------------------------------+
\| JSON_LENGTH('{"a": 1, "b": {"c": 30}}') \|
+-----------------------------------------+
\| 2 \|
+-----------------------------------------+
1 row in set (0.00 sec)

relates to

MDEV-9143 JSON_xxx functions