dbms: add test for Enums [#METR-19265]

dbms/tests/queries/0_stateless/00294_enums.reference

+d	Date	DEFAULT	CAST(\'2015-12-29\' AS Date)
+k	UInt8	DEFAULT	0
+e	Enum8(\'hello\' = 1, \'world\' = 2)		
+sign	Enum8(\'minus\' = -1, \'plus\' = 1)		
+letter	Enum16(\'*\' = -256, \'a\' = 0, \'b\' = 1, \'c\' = 2)		
+2015-12-29	0	hello	minus	*
+d	Date	DEFAULT	CAST(\'2015-12-29\' AS Date)
+k	UInt8	DEFAULT	0
+e	Enum8(\'hello\' = 1, \'world\' = 2, \'!\' = 3)		
+sign	Enum8(\'minus\' = -1, \'plus\' = 1)		
+letter	Enum16(\'*\' = -256, \'a\' = 0, \'b\' = 1, \'c\' = 2)		
+2015-12-29	0	!	plus	b
+2015-12-29	0	hello	minus	*
+d	Date	DEFAULT	CAST(\'2015-12-29\' AS Date)
+k	UInt8	DEFAULT	0
+e	Enum16(\'hello\' = 1, \'world\' = 2, \'!\' = 3)		
+sign	Enum16(\'minus\' = -1, \'plus\' = 1)		
+letter	Enum16(\'no letter\' = -256, \'a\' = 0, \'b\' = 1, \'c\' = 2)		
+2015-12-29	0	!	plus	b
+2015-12-29	0	hello	minus	no letter
+d	Date	DEFAULT	CAST(\'2015-12-29\' AS Date)
+k	UInt8	DEFAULT	0
+e	Enum8(\'hello\' = 1, \'world\' = 2, \'!\' = 3)		
+sign	Enum8(\'minus\' = -1, \'plus\' = 1)		
+letter	Enum16(\'no letter\' = -256, \'a\' = 0, \'b\' = 1, \'c\' = 2)		
+2015-12-29	0	!	plus	b
+2015-12-29	0	hello	minus	no letter
+2015-12-29	0	world	minus	c
+d
+b
+a
+c
+a
+d
+a
+a
+b
+c
+d
+d
+d
+d
+c
+b
+a
+a
+2	a
+1	b
+1	c
+2	d
+d
+d
+a
+a
+d
+d
+b
+a
+c
+a
+d
+d
+b
+a
+c
+d
+b
+a
+c
+a
+d
+d
+a
+a
+d
+d
+b
+c
+d
+d	0
+b	0
+a	1
+c	0
+a	1
+d	0
+d	1
+b	0
+a	0
+c	1
+a	0
+d	1
+3	3	3	d	d
+1	1	1	b	b
+0	0	0	a	a
+2	2	2	c	c
+0	0	0	a	a
+3	3	3	d	d
+d
+b
+a
+c
+a
+d
+d
+b
+a
+c
+a
+d

dbms/tests/queries/0_stateless/00294_enums.sql

+drop table if exists test.enums;
+
+create table test.enums (
+	d Date default '2015-12-29', k default 0,
+	e Enum8('world' = 2, 'hello' = 1), sign Enum8('minus' = -1, 'plus' = 1),
+	letter Enum16('a' = 0, 'b' = 1, 'c' = 2, '*' = -256)
+) engine = MergeTree(d, k, 1);
+
+desc table test.enums;
+
+-- insert default values
+insert into test.enums (k) values (0);
+select * from test.enums;
+
+alter table test.enums modify column e Enum8('world' = 2, 'hello' = 1, '!' = 3);
+desc table test.enums;
+
+insert into test.enums (e, sign, letter) values ('!', 'plus', 'b');
+select * from test.enums;
+
+-- expand `e` and `sign` from Enum8 to Enum16 without changing values, change values of `letter` without changing type
+alter table test.enums
+	modify column e Enum16('world' = 2, 'hello' = 1, '!' = 3),
+	modify column sign Enum16('minus' = -1, 'plus' = 1),
+	modify column letter Enum16('a' = 0, 'b' = 1, 'c' = 2, 'no letter' = -256);
+desc table test.enums;
+
+select * from test.enums;
+
+alter table test.enums
+	modify column e Enum8('world' = 2, 'hello' = 1, '!' = 3),
+	modify column sign Enum8('minus' = -1, 'plus' = 1);
+
+desc table test.enums;
+
+insert into test.enums (letter, e) values ('c', 'world');
+select * from test.enums;
+
+drop table test.enums;
+
+create table test.enums (e Enum8('a' = 0, 'b' = 1, 'c' = 2, 'd' = 3)) engine = TinyLog;
+insert into test.enums values ('d'), ('b'), ('a'), ('c'), ('a'), ('d');
+select * from test.enums;
+
+-- ORDER BY
+select * from test.enums order by e;
+select * from test.enums order by e desc;
+
+-- GROUP BY
+select count(), e from test.enums group by e;
+select any(e) from test.enums;
+
+-- IN
+select * from test.enums where e in ('a', 'd');
+select * from test.enums where e in (select e from test.enums);
+
+-- DISTINCT
+select distinct e from test.enums;
+
+-- Comparison
+select * from test.enums where e = e;
+select * from test.enums where e = 'a' or e = 'd';
+select * from test.enums where e != 'a';
+select *, e < 'b' from test.enums;
+select *, e > 'b' from test.enums;
+
+-- Conversion
+select toInt8(e), toInt16(e), toUInt64(e), toString(e), e from test.enums;
+
+drop table if exists test.enums_copy;
+create table test.enums_copy engine = TinyLog as select * from test.enums;
+select * from test.enums_copy;
+
+drop table test.enums_copy;
+create table test.enums_copy engine = TinyLog as select * from remote('localhost', test, enums);
+select * from remote('localhost', test, enums_copy);
+
+drop table test.enums_copy;
+drop table test.enums;