---+\nmysql> SELECT JSON_DEPTH(\'[10, {"a": 20}]\');\n+-------------------------------+\n| JSON_DEPTH(\'[10, {"a": 20}]\') |\n+-------------------------------+\n|                             3 |\n+-------------------------------+\n','http://dev.mysql.com/doc/refman/5.7/en/json-attribute-functions.html');