--- json_path_exists ---
SELECT json_path_exists(parse_json('{"a": 1, "b": 2}'), '$.a');

+--------------------------------------------------------------------+
| json_path_exists(parse_json(Utf8("{"a": 1, "b": 2}")),Utf8("$.a")) |
+--------------------------------------------------------------------+
| true                                                               |
+--------------------------------------------------------------------+

SELECT json_path_exists(parse_json('{"a": 1, "b": 2}'), '$.c');

+--------------------------------------------------------------------+
| json_path_exists(parse_json(Utf8("{"a": 1, "b": 2}")),Utf8("$.c")) |
+--------------------------------------------------------------------+
| false                                                              |
+--------------------------------------------------------------------+

SELECT json_path_exists(parse_json('[1, 2]'), '[0]');

+----------------------------------------------------------+
| json_path_exists(parse_json(Utf8("[1, 2]")),Utf8("[0]")) |
+----------------------------------------------------------+
| true                                                     |
+----------------------------------------------------------+

SELECT json_path_exists(parse_json('[1, 2]'), '[2]');

+----------------------------------------------------------+
| json_path_exists(parse_json(Utf8("[1, 2]")),Utf8("[2]")) |
+----------------------------------------------------------+
| false                                                    |
+----------------------------------------------------------+