USE tpch1;
DROP TABLE IF EXISTS mcol128;
CREATE TABLE mcol128 (a int, b varchar(50));
INSERT INTO mcol128 VALUES (1, 'hello'),(2, 'world');
SELECT * FROM mcol128;
a	b
1	hello
2	world
ALTER TABLE mcol128 ENGINE=Columnstore;
SELECT * FROM mcol128;
a	b
1	hello
2	world
ALTER TABLE mcol128 ENGINE=InnoDB;
SELECT * FROM mcol128;
a	b
1	hello
2	world
DROP TABLE IF EXISTS mcol128_clone;
CREATE TABLE mcol128_clone ENGINE=Columnstore AS SELECT * FROM mcol128;
SELECT * FROM mcol128_clone;
a	b
1	hello
2	world
DROP TABLE mcol128_clone;
DROP TABLE mcol128;