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# Testing of CASE
#
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
select CASE "b" when "a" then 1 when "b" then 2 END;
select CASE "c" when "a" then 1 when "b" then 2 END;
select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END;
select CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END;
select CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END;
select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end;
select CASE when 1=0 then "true" else "false" END;
select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
explain extended select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
select CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END;
select (CASE "two" when "one" then "1" WHEN "two" then "2" END);
select (CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0;
--error ER_DIVISION_BY_ZERO
select case 1/0 when "a" then "true" else "false" END;
--error ER_DIVISION_BY_ZERO
select case 1/0 when "a" then "true" END;
--error ER_DIVISION_BY_ZERO
select (case 1/0 when "a" then "true" END);
--error ER_DIVISION_BY_ZERO
select (case 1/0 when "a" then "true" END) + 0.0;
select case when 1>0 then "TRUE" else "FALSE" END;
select case when 1<0 then "TRUE" else "FALSE" END;
#
# Test bug when using GROUP BY on CASE
#
create table t1 (a int);
insert into t1 values(1),(2),(3),(4);
select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
explain extended select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
drop table t1;
#
# Test MAX(CASE ... ) that can return null
#
create table t1 (row int not null, col int not null, val varchar(255) not null);
insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
select max(case col when 1 then val else null end) as color from t1 group by row;
drop table t1;
#
# CASE and argument types/collations aggregation into result
#
CREATE TABLE t1 SELECT
CASE WHEN 1 THEN 'a' COLLATE utf8_bin ELSE 'a' END AS c1,
CASE WHEN 1 THEN 'a' ELSE 'a' COLLATE utf8_bin END AS c2,
CASE WHEN 1 THEN 'a' ELSE 1 END AS c3,
CASE WHEN 1 THEN 1 ELSE 'a' END AS c4,
CASE WHEN 1 THEN 'a' ELSE 1.0 END AS c5,
CASE WHEN 1 THEN 1.0 ELSE 'a' END AS c6,
CASE WHEN 1 THEN 1 ELSE 1.0 END AS c7,
CASE WHEN 1 THEN 1.0 ELSE 1 END AS c8,
CASE WHEN 1 THEN 1.0 END AS c9,
CASE WHEN 1 THEN 0.1e1 else 0.1 END AS c10,
CASE WHEN 1 THEN 0.1e1 else 1 END AS c11,
CASE WHEN 1 THEN 0.1e1 else '1' END AS c12
;
--replace_regex /ENGINE=[a-zA-Z]+/ENGINE=DEFAULT/
SHOW CREATE TABLE t1;
DROP TABLE t1;
--error ER_CANT_AGGREGATE_2COLLATIONS
SELECT CASE
WHEN 1
THEN 'a' COLLATE utf8_bin
ELSE 'a' COLLATE utf8_swedish_ci
END;
--error ER_CANT_AGGREGATE_3COLLATIONS
SELECT CASE 'a' COLLATE utf8_bin
WHEN 'a' COLLATE utf8_danish_ci THEN 1
WHEN 'a' COLLATE utf8_swedish_ci THEN 2
END;
SELECT
CASE 'a' COLLATE utf8_general_ci WHEN 'A' THEN '1' ELSE 2 END,
CASE 'a' COLLATE utf8_bin WHEN 'A' THEN '1' ELSE 2 END,
CASE 'a' WHEN 'A' COLLATE utf8_swedish_ci THEN '1' ELSE 2 END,
CASE 'a' WHEN 'A' COLLATE utf8_bin THEN '1' ELSE 2 END
;
#
# COALESCE is a CASE abbrevation:
#
# COALESCE(v1,v2) == CASE WHEN v1 IS NOT NULL THEN v1 ELSE v2 END
#
# COALESCE(V1, V2, . . . ,Vn ) =
# CASE WHEN V1 IS NOT NULL THEN V1 ELSE COALESCE (V2, . . . ,Vn) END
#
# Check COALESCE argument types aggregation
--error ER_CANT_AGGREGATE_2COLLATIONS
CREATE TABLE t1 SELECT COALESCE('a' COLLATE utf8_swedish_ci,'b' COLLATE utf8_bin);
CREATE TABLE t1 SELECT
COALESCE(1), COALESCE(1.0),COALESCE('a'),
COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
COALESCE('a' COLLATE utf8_bin,'b');
explain extended SELECT
COALESCE(1), COALESCE(1.0),COALESCE('a'),
COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
COALESCE('a' COLLATE utf8_bin,'b');
--replace_regex /ENGINE=[a-zA-Z]+/ENGINE=DEFAULT/
SHOW CREATE TABLE t1;
DROP TABLE t1;
# Test for BUG#10151
SELECT 'case+union+test'
UNION
SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
SELECT 'case+union+test'
UNION
SELECT CASE '1' WHEN '2' THEN 'BUG' ELSE 'nobug' END;
#
# Bug #17896: problem with MIN(CASE...)
#
create table t1(a float, b int default 3);
insert into t1 (a) values (2), (11), (8);
select min(a), min(case when 1=1 then a else NULL end),
min(case when 1!=1 then NULL else a end)
from t1 where b=3 group by b;
drop table t1;
#
# Tests for bug #9939: conversion of the arguments for COALESCE and IFNULL
#
CREATE TABLE t1 (EMPNUM INT);
INSERT INTO t1 VALUES (0), (2);
CREATE TABLE t2 (EMPNUM DECIMAL (4, 2));
INSERT INTO t2 VALUES (0.0), (9.0);
SELECT COALESCE(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
SELECT IFNULL(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
DROP TABLE t1,t2;
--echo End of 4.1 tests
#
# #30782: Truncated BIGINT columns
#
create table t1 (a int, b bigint unsigned);
create table t2 (c int);
insert into t1 (a, b) values (1,4572794622775114594), (2,18196094287899841997),
(3,11120436154190595086);
insert into t2 (c) values (1), (2), (3);
select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
join t2 on t1.a=t2.c order by d;
select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
join t2 on t1.a=t2.c where b=11120436154190595086 order by d;
drop table t1, t2;
--echo End of 5.0 tests
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