DROP DATABASE IF EXISTS MCOL5842;
CREATE DATABASE MCOL5842;
USE MCOL5842;
CREATE TABLE tcs(t TEXT) ENGINE=Columnstore;
INSERT INTO tcs(t) VALUES ('');
SELECT JSON_OBJECT('t', t, 'a', 'b') FROM tcs;
JSON_OBJECT('t', t, 'a', 'b')
{"t": "", "a": "b"}
SELECT GROUP_CONCAT(JSON_OBJECT('t', t, 'a', 'b')) FROM tcs;
GROUP_CONCAT(JSON_OBJECT('t', t, 'a', 'b'))
{"t": "", "a": "b"}
DROP DATABASE MCOL5842;