SELECT '--JSON_VALUE--';
SELECT JSON_VALUE('$', '{"hello":1}'); -- root is a complex object => default value (empty string)
SELECT JSON_VALUE('$.hello', '{"hello":1}');
SELECT JSON_VALUE('$.hello', '{"hello":1.2}');
SELECT JSON_VALUE('$.hello', '{"hello":true}');
SELECT JSON_VALUE('$.hello', '{"hello":"world"}');
SELECT JSON_VALUE('$.hello', '{"hello":null}');
SELECT JSON_VALUE('$.hello', '{"hello":["world","world2"]}');
SELECT JSON_VALUE('$.hello', '{"hello":{"world":"!"}}');
SELECT JSON_VALUE('$.hello', '{hello:world}'); -- invalid json => default value (empty string)
SELECT JSON_VALUE('$.hello', '');

SELECT '--JSON_QUERY--';
SELECT JSON_QUERY('$', '{"hello":1}');
SELECT JSON_QUERY('$.hello', '{"hello":1}');
SELECT JSON_QUERY('$.hello', '{"hello":1.2}');
SELECT JSON_QUERY('$.hello', '{"hello":true}');
SELECT JSON_QUERY('$.hello', '{"hello":"world"}');
SELECT JSON_QUERY('$.hello', '{"hello":null}');
SELECT JSON_QUERY('$.hello', '{"hello":["world","world2"]}');
SELECT JSON_QUERY('$.hello', '{"hello":{"world":"!"}}');
SELECT JSON_QUERY('$.hello', '{hello:{"world":"!"}}}'); -- invalid json => default value (empty string)
SELECT JSON_QUERY('$.hello', '');
SELECT JSON_QUERY('$.array[*][0 to 2, 4]', '{"array":[[0, 1, 2, 3, 4, 5], [0, -1, -2, -3, -4, -5]]}');

SELECT '--JSON_EXISTS--';
SELECT JSON_EXISTS('$', '{"hello":1}');
SELECT JSON_EXISTS('$', '');
SELECT JSON_EXISTS('$', '{}');
SELECT JSON_EXISTS('$.hello', '{"hello":1}');
SELECT JSON_EXISTS('$.world', '{"hello":1,"world":2}');
SELECT JSON_EXISTS('$.world', '{"hello":{"world":1}}');
SELECT JSON_EXISTS('$.hello.world', '{"hello":{"world":1}}');
SELECT JSON_EXISTS('$.hello', '{hello:world}'); -- invalid json => default value (zero integer)
SELECT JSON_EXISTS('$.hello', '');
SELECT JSON_EXISTS('$.hello[*]', '{"hello":["world"]}');
SELECT JSON_EXISTS('$.hello[0]', '{"hello":["world"]}');
SELECT JSON_EXISTS('$.hello[1]', '{"hello":["world"]}');
SELECT JSON_EXISTS('$.a[*].b', '{"a":[{"b":1},{"c":2}]}');
SELECT JSON_EXISTS('$.a[*].f', '{"a":[{"b":1},{"c":2}]}');
SELECT JSON_EXISTS('$.a[*][0].h', '{"a":[[{"b":1}, {"g":1}],[{"h":1},{"y":1}]]}');

SELECT '--MANY ROWS--';
DROP TABLE IF EXISTS 01889_sql_json;
CREATE TABLE 01889_sql_json (id UInt8, json String) ENGINE = MergeTree ORDER BY id;
INSERT INTO 01889_sql_json(id, json) VALUES(0, '{"name":"Ivan","surname":"Ivanov","friends":["Vasily","Kostya","Artyom"]}');
INSERT INTO 01889_sql_json(id, json) VALUES(1, '{"name":"Katya","surname":"Baltica","friends":["Tihon","Ernest","Innokentiy"]}');
INSERT INTO 01889_sql_json(id, json) VALUES(2, '{"name":"Vitali","surname":"Brown","friends":["Katya","Anatoliy","Ivan","Oleg"]}');
SELECT id, JSON_QUERY('$.friends[0 to 2]', json) FROM 01889_sql_json ORDER BY id;
DROP TABLE 01889_sql_json;