DROP DATABASE IF EXISTS mcs286_db;
CREATE DATABASE mcs286_db;
USE mcs286_db;
CREATE TABLE t1 (a INT, b CHAR(15))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, NULL),(1, 'mariadb'),(2, 'columnstore'),(3, 'Innodb');
SELECT LEFT('mariadb cs', 7) FROM t1 LIMIT 1;
LEFT('mariadb cs', 7)
mariadb
SELECT LEFT('mariadb cs', 8) FROM t1 LIMIT 1;
LEFT('mariadb cs', 8)
mariadb 
SELECT LEFT('mariadb cs', 9) FROM t1 LIMIT 1;
LEFT('mariadb cs', 9)
mariadb c
SELECT b, LEFT(b, 0) FROM t1 ORDER BY 1;
b	LEFT(b, 0)
NULL	NULL
columnstore	
Innodb	
mariadb	
SELECT b, LEFT(b, -1) FROM t1 ORDER BY 1;
b	LEFT(b, -1)
NULL	NULL
columnstore	
Innodb	
mariadb	
SELECT b, LEFT(b, 6) FROM t1 ORDER BY 1;
b	LEFT(b, 6)
NULL	NULL
columnstore	column
Innodb	Innodb
mariadb	mariad
SELECT b, LEFT(b, 9) FROM t1 ORDER BY 1;
b	LEFT(b, 9)
NULL	NULL
columnstore	columnsto
Innodb	Innodb
mariadb	mariadb
SELECT b, LEFT(concat('mmm_', b), 10) FROM t1 ORDER BY 1;
b	LEFT(concat('mmm_', b), 10)
NULL	NULL
columnstore	mmm_column
Innodb	mmm_Innodb
mariadb	mmm_mariad
DROP DATABASE mcs286_db;