JSON_LENGTH, JSON_DEPTH, JSON_INSERT, JSON_QUOTE shouldn't implicitly cast argument to json

[YangKeao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

mysql> SELECT JSON_LENGTH(123);
ERROR 3146 (22032): Invalid data type for JSON data in argument 1 to function json_length; a JSON string or JSON type is required.
mysql> SELECT JSON_LENGTH(123.45);
ERROR 3146 (22032): Invalid data type for JSON data in argument 1 to function json_length; a JSON string or JSON type is required.
mysql> SELECT JSON_LENGTH(CAST('{"i": 0}' AS BINARY));
ERROR 3144 (22032): Cannot create a JSON value from a string with CHARACTER SET 'binary'.

3. What did you see instead (Required)

mysql> SELECT JSON_LENGTH(123);
+------------------+
| JSON_LENGTH(123) |
+------------------+
|                1 |
+------------------+
1 row in set (0.01 sec)

mysql> SELECT JSON_LENGTH(123.45);
+---------------------+
| JSON_LENGTH(123.45) |
+---------------------+
|                   1 |
+---------------------+
1 row in set (0.00 sec)

mysql> SELECT JSON_LENGTH(CAST('{"i": 0}' AS BINARY));
+-----------------------------------------+
| JSON_LENGTH(CAST('{"i": 0}' AS BINARY)) |
+-----------------------------------------+
|                                       1 |
+-----------------------------------------+
1 row in set (0.01 sec)

4. What is your TiDB version? (Required)

[YangKeao]

Other functions has similar issue, see

SELECT JSON_DEPTH(10);
SELECT JSON_DEPTH(TRUE);
SELECT JSON_INSERT(123, '$.a', 'test');
SELECT JSON_QUOTE(X'7B');
SELECT JSON_QUOTE(BINARY '\0\x1F');
SELECT JSON_QUOTE(0xDEADBEEF);