-- { echo }
SELECT '--JSON_VALUE--';
--JSON_VALUE--
SELECT JSON_VALUE('{"hello":1}', '$'); -- root is a complex object => default value (empty string)

SELECT JSON_VALUE('{"hello":1}', '$.hello');
1
SELECT JSON_VALUE('{"hello":1.2}', '$.hello');
1.2
SELECT JSON_VALUE('{"hello":true}', '$.hello');
true
SELECT JSON_VALUE('{"hello":"world"}', '$.hello');
world
SELECT JSON_VALUE('{"hello":null}', '$.hello');
null
SELECT JSON_VALUE('{"hello":["world","world2"]}', '$.hello');

SELECT JSON_VALUE('{"hello":{"world":"!"}}', '$.hello');

SELECT JSON_VALUE('{hello:world}', '$.hello'); -- invalid json => default value (empty string)

SELECT JSON_VALUE('', '$.hello');

SELECT JSON_VALUE('{"foo foo":"bar"}', '$."foo foo"');
bar
SELECT JSON_VALUE('{"hello":"\\uD83C\\uDF3A \\uD83C\\uDF38 \\uD83C\\uDF37 Hello, World \\uD83C\\uDF37 \\uD83C\\uDF38 \\uD83C\\uDF3A"}', '$.hello');
🌺 🌸 🌷 Hello, World 🌷 🌸 🌺
SELECT JSON_VALUE('{"a":"Hello \\"World\\" \\\\"}', '$.a');
Hello "World" \\
select JSON_VALUE('{"a":"\\n\\u0000"}', '$.a');
\n\0
select JSON_VALUE('{"a":"\\u263a"}', '$.a');
☺
SELECT '--JSON_QUERY--';
--JSON_QUERY--
SELECT JSON_QUERY('{"hello":1}', '$');
[{"hello":1}]
SELECT JSON_QUERY('{"hello":1}', '$.hello');
[1]
SELECT JSON_QUERY('{"hello":1.2}', '$.hello');
[1.2]
SELECT JSON_QUERY('{"hello":true}', '$.hello');
[true]
SELECT JSON_QUERY('{"hello":"world"}', '$.hello');
["world"]
SELECT JSON_QUERY('{"hello":null}', '$.hello');
[null]
SELECT JSON_QUERY('{"hello":["world","world2"]}', '$.hello');
[["world","world2"]]
SELECT JSON_QUERY('{"hello":{"world":"!"}}', '$.hello');
[{"world":"!"}]
SELECT JSON_QUERY( '{hello:{"world":"!"}}}', '$.hello'); -- invalid json => default value (empty string)

SELECT JSON_QUERY('', '$.hello');

SELECT JSON_QUERY('{"array":[[0, 1, 2, 3, 4, 5], [0, -1, -2, -3, -4, -5]]}', '$.array[*][0 to 2, 4]');
[0, 1, 4, 0, -1, -4]
SELECT '--JSON_EXISTS--';
--JSON_EXISTS--
SELECT JSON_EXISTS('{"hello":1}', '$');
1
SELECT JSON_EXISTS('', '$');
0
SELECT JSON_EXISTS('{}', '$');
1
SELECT JSON_EXISTS('{"hello":1}', '$.hello');
1
SELECT JSON_EXISTS('{"hello":1,"world":2}', '$.world');
1
SELECT JSON_EXISTS('{"hello":{"world":1}}', '$.world');
0
SELECT JSON_EXISTS('{"hello":{"world":1}}', '$.hello.world');
1
SELECT JSON_EXISTS('{hello:world}', '$.hello'); -- invalid json => default value (zero integer)
0
SELECT JSON_EXISTS('', '$.hello');
0
SELECT JSON_EXISTS('{"hello":["world"]}', '$.hello[*]');
1
SELECT JSON_EXISTS('{"hello":["world"]}', '$.hello[0]');
1
SELECT JSON_EXISTS('{"hello":["world"]}', '$.hello[1]');
0
SELECT JSON_EXISTS('{"a":[{"b":1},{"c":2}]}', '$.a[*].b');
1
SELECT JSON_EXISTS('{"a":[{"b":1},{"c":2}]}', '$.a[*].f');
0
SELECT JSON_EXISTS('{"a":[[{"b":1}, {"g":1}],[{"h":1},{"y":1}]]}', '$.a[*][0].h');
1
SELECT '--MANY ROWS--';
--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(json, '$.friends[0 to 2]') FROM 01889_sql_json ORDER BY id;
0	["Vasily", "Kostya"]
1	["Tihon", "Ernest"]
2	["Katya", "Anatoliy"]
SELECT id, JSON_VALUE(json, '$.friends[0]') FROM 01889_sql_json ORDER BY id;
0	Vasily
1	Tihon
2	Katya
DROP TABLE 01889_sql_json;