-- json_is functions --
SELECT json_is_object(parse_json('{"a": 1}'));

+----------------------------------------------+
| json_is_object(parse_json(Utf8("{"a": 1}"))) |
+----------------------------------------------+
| true                                         |
+----------------------------------------------+

SELECT json_is_array(parse_json('[1, 2, 3]'));

+----------------------------------------------+
| json_is_array(parse_json(Utf8("[1, 2, 3]"))) |
+----------------------------------------------+
| true                                         |
+----------------------------------------------+

SELECT json_is_int(parse_json('1'));

+------------------------------------+
| json_is_int(parse_json(Utf8("1"))) |
+------------------------------------+
| true                               |
+------------------------------------+

SELECT json_is_bool(parse_json('true'));

+----------------------------------------+
| json_is_bool(parse_json(Utf8("true"))) |
+----------------------------------------+
| true                                   |
+----------------------------------------+

SELECT json_is_null(parse_json('null'));

+----------------------------------------+
| json_is_null(parse_json(Utf8("null"))) |
+----------------------------------------+
| true                                   |
+----------------------------------------+

SELECT json_is_float(parse_json('1.2'));

+----------------------------------------+
| json_is_float(parse_json(Utf8("1.2"))) |
+----------------------------------------+
| true                                   |
+----------------------------------------+

SELECT json_is_string(parse_json('"foo"'));

+-------------------------------------------+
| json_is_string(parse_json(Utf8(""foo""))) |
+-------------------------------------------+
| true                                      |
+-------------------------------------------+

SELECT json_is_null(parse_json('{"a": 1}'));

+--------------------------------------------+
| json_is_null(parse_json(Utf8("{"a": 1}"))) |
+--------------------------------------------+
| false                                      |
+--------------------------------------------+

SELECT json_is_string(parse_json('[1, 2, 3]'));

+-----------------------------------------------+
| json_is_string(parse_json(Utf8("[1, 2, 3]"))) |
+-----------------------------------------------+
| false                                         |
+-----------------------------------------------+

SELECT json_is_float(parse_json('1'));

+--------------------------------------+
| json_is_float(parse_json(Utf8("1"))) |
+--------------------------------------+
| true                                 |
+--------------------------------------+

-- test json_is functions in table rows and WHERE clause --
CREATE TABLE jsons(j JSON, ts timestamp time index);

Affected Rows: 0

INSERT INTO jsons VALUES(parse_json('{"a": 1}'), 1);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('[1, 2, 3]'), 2);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('1'), 3);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('true'), 4);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('null'), 5);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('1.2'), 6);

Affected Rows: 1

INSERT INTO jsons VALUES(parse_json('"foo"'), 7);

Affected Rows: 1

SELECT json_to_string(j) FROM jsons WHERE json_is_object(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| {"a":1}                 |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_array(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| [1,2,3]                 |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_int(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| 1                       |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_bool(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| true                    |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_null(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| null                    |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_float(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| 1                       |
| 1.2                     |
+-------------------------+

SELECT json_to_string(j) FROM jsons WHERE json_is_string(j);

+-------------------------+
| json_to_string(jsons.j) |
+-------------------------+
| "foo"                   |
+-------------------------+

DROP TABLE jsons;

Affected Rows: 0