mirror of
https://github.com/MariaDB/server.git
synced 2025-01-31 02:51:44 +01:00
9a987142f9
This is a backport of the patch for MDEV-9653 (fixed earlier in 10.1.13). The code in Item_func_case::fix_length_and_dec() did not calculate max_length and decimals properly. In case of any numeric result (DECIMAL, REAL, INT) a generic method Item_func_case::agg_num_lengths() was called, which could erroneously result into a DECIMAL item with max_length==0 and decimals==0, so the constructor of Field_new_decimals tried to create a field of DECIMAL(0,0) type, which caused a crash. Unlike Item_func_case, the code responsible for merging attributes in Item_func_coalesce::fix_length_and_dec() works fine: it has specific execution branches for all distinct numeric types and correctly creates a DECIMAL(1,0) column instead of DECIMAL(0,0) for the same set of arguments. The fix does the following: - Moves the attribute merging code from Item_func_coalesce::fix_length_and_dec() to a new method Item_func_hybrid_result_type::fix_attributes() - Removes the wrong code from Item_func_case::fix_length_and_dec() and reuses fix_attributes() in both Item_func_coalesce::fix_length_and_dec() and Item_func_case::fix_length_and_dec() - Fixes count_real_length() and count_decimal_length() to get an array of Items as an argument, instead of using Item::args directly. This is needed for Item_func_case::fix_length_and_dec(). - Moves methods Item_func::count_xxx_length() from "public" to "protected". - Removes Item_func_case::agg_num_length(), as it's not used any more. - Additionally removes Item_func_case::agg_str_length(), as it also was not used (dead code).
246 lines
10 KiB
Text
246 lines
10 KiB
Text
drop table if exists t1, t2;
|
|
select CASE "b" when "a" then 1 when "b" then 2 END;
|
|
CASE "b" when "a" then 1 when "b" then 2 END
|
|
2
|
|
select CASE "c" when "a" then 1 when "b" then 2 END;
|
|
CASE "c" when "a" then 1 when "b" then 2 END
|
|
NULL
|
|
select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END;
|
|
CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END
|
|
3
|
|
select CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END;
|
|
CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END
|
|
ok
|
|
select CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END;
|
|
CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END
|
|
ok
|
|
select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end;
|
|
CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end
|
|
a
|
|
select CASE when 1=0 then "true" else "false" END;
|
|
CASE when 1=0 then "true" else "false" END
|
|
false
|
|
select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
|
|
CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END
|
|
one
|
|
explain extended select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
Warnings:
|
|
Note 1003 select (case 1 when 1 then 'one' when 2 then 'two' else 'more' end) AS `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;
|
|
CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END
|
|
two
|
|
select (CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0;
|
|
(CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0
|
|
2
|
|
select (CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0;
|
|
(CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0
|
|
2.00
|
|
select case 1/0 when "a" then "true" else "false" END;
|
|
case 1/0 when "a" then "true" else "false" END
|
|
false
|
|
select case 1/0 when "a" then "true" END;
|
|
case 1/0 when "a" then "true" END
|
|
NULL
|
|
select (case 1/0 when "a" then "true" END) | 0;
|
|
(case 1/0 when "a" then "true" END) | 0
|
|
NULL
|
|
select (case 1/0 when "a" then "true" END) + 0.0;
|
|
(case 1/0 when "a" then "true" END) + 0.0
|
|
NULL
|
|
select case when 1>0 then "TRUE" else "FALSE" END;
|
|
case when 1>0 then "TRUE" else "FALSE" END
|
|
TRUE
|
|
select case when 1<0 then "TRUE" else "FALSE" END;
|
|
case when 1<0 then "TRUE" else "FALSE" END
|
|
FALSE
|
|
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;
|
|
fcase count(*)
|
|
0 2
|
|
2 1
|
|
3 1
|
|
explain extended select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 100.00 Using temporary; Using filesort
|
|
Warnings:
|
|
Note 1003 select (case `test`.`t1`.`a` when 1 then 2 when 2 then 3 else 0 end) AS `fcase`,count(0) AS `count(*)` from `test`.`t1` group by (case `test`.`t1`.`a` when 1 then 2 when 2 then 3 else 0 end)
|
|
select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
|
|
fcase count(*)
|
|
nothing 2
|
|
one 1
|
|
two 1
|
|
drop table t1;
|
|
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;
|
|
color
|
|
orange
|
|
yellow
|
|
green
|
|
drop table t1;
|
|
SET NAMES latin1;
|
|
CREATE TABLE t1 SELECT
|
|
CASE WHEN 1 THEN _latin1'a' COLLATE latin1_danish_ci ELSE _latin1'a' END AS c1,
|
|
CASE WHEN 1 THEN _latin1'a' ELSE _latin1'a' COLLATE latin1_danish_ci 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
|
|
;
|
|
SHOW CREATE TABLE t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`c1` varchar(1) CHARACTER SET latin1 COLLATE latin1_danish_ci NOT NULL DEFAULT '',
|
|
`c2` varchar(1) CHARACTER SET latin1 COLLATE latin1_danish_ci NOT NULL DEFAULT '',
|
|
`c3` varchar(1) NOT NULL DEFAULT '',
|
|
`c4` varchar(1) NOT NULL DEFAULT '',
|
|
`c5` varchar(4) NOT NULL DEFAULT '',
|
|
`c6` varchar(4) NOT NULL DEFAULT '',
|
|
`c7` decimal(2,1) NOT NULL DEFAULT '0.0',
|
|
`c8` decimal(2,1) NOT NULL DEFAULT '0.0',
|
|
`c9` decimal(2,1) DEFAULT NULL,
|
|
`c10` double NOT NULL DEFAULT '0',
|
|
`c11` double NOT NULL DEFAULT '0',
|
|
`c12` varchar(5) NOT NULL DEFAULT ''
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
DROP TABLE t1;
|
|
SELECT CASE
|
|
WHEN 1
|
|
THEN _latin1'a' COLLATE latin1_danish_ci
|
|
ELSE _latin1'a' COLLATE latin1_swedish_ci
|
|
END;
|
|
ERROR HY000: Illegal mix of collations (latin1_danish_ci,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'case'
|
|
SELECT CASE _latin1'a' COLLATE latin1_general_ci
|
|
WHEN _latin1'a' COLLATE latin1_danish_ci THEN 1
|
|
WHEN _latin1'a' COLLATE latin1_swedish_ci THEN 2
|
|
END;
|
|
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_danish_ci,EXPLICIT), (latin1_swedish_ci,EXPLICIT) for operation 'case'
|
|
SELECT
|
|
CASE _latin1'a' COLLATE latin1_general_ci WHEN _latin1'A' THEN '1' ELSE 2 END,
|
|
CASE _latin1'a' COLLATE latin1_bin WHEN _latin1'A' THEN '1' ELSE 2 END,
|
|
CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END,
|
|
CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin THEN '1' ELSE 2 END
|
|
;
|
|
CASE _latin1'a' COLLATE latin1_general_ci WHEN _latin1'A' THEN '1' ELSE 2 END CASE _latin1'a' COLLATE latin1_bin WHEN _latin1'A' THEN '1' ELSE 2 END CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin THEN '1' ELSE 2 END
|
|
1 2 1 2
|
|
CREATE TABLE t1 SELECT COALESCE(_latin1'a',_latin2'a');
|
|
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'coalesce'
|
|
CREATE TABLE t1 SELECT COALESCE('a' COLLATE latin1_swedish_ci,'b' COLLATE latin1_bin);
|
|
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'coalesce'
|
|
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 latin1_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 latin1_bin,'b');
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
Warnings:
|
|
Note 1003 select coalesce(1) AS `COALESCE(1)`,coalesce(1.0) AS `COALESCE(1.0)`,coalesce('a') AS `COALESCE('a')`,coalesce(1,1.0) AS `COALESCE(1,1.0)`,coalesce(1,'1') AS `COALESCE(1,'1')`,coalesce(1.1,'1') AS `COALESCE(1.1,'1')`,coalesce(('a' collate latin1_bin),'b') AS `COALESCE('a' COLLATE latin1_bin,'b')`
|
|
SHOW CREATE TABLE t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`COALESCE(1)` int(1) NOT NULL DEFAULT '0',
|
|
`COALESCE(1.0)` decimal(2,1) NOT NULL DEFAULT '0.0',
|
|
`COALESCE('a')` varchar(1) NOT NULL DEFAULT '',
|
|
`COALESCE(1,1.0)` decimal(2,1) NOT NULL DEFAULT '0.0',
|
|
`COALESCE(1,'1')` varchar(1) NOT NULL DEFAULT '',
|
|
`COALESCE(1.1,'1')` varchar(4) NOT NULL DEFAULT '',
|
|
`COALESCE('a' COLLATE latin1_bin,'b')` varchar(1) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT ''
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 SELECT IFNULL('a' COLLATE latin1_swedish_ci, 'b' COLLATE latin1_bin);
|
|
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'ifnull'
|
|
SELECT 'case+union+test'
|
|
UNION
|
|
SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
|
|
case+union+test
|
|
case+union+test
|
|
nobug
|
|
SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
|
|
CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END
|
|
nobug
|
|
SELECT 'case+union+test'
|
|
UNION
|
|
SELECT CASE '1' WHEN '2' THEN 'BUG' ELSE 'nobug' END;
|
|
case+union+test
|
|
case+union+test
|
|
nobug
|
|
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;
|
|
min(a) min(case when 1=1 then a else NULL end) min(case when 1!=1 then NULL else a end)
|
|
2 2 2
|
|
drop table t1;
|
|
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;
|
|
CEMPNUM EMPMUM1 EMPNUM2
|
|
0.00 0 0.00
|
|
2.00 2 NULL
|
|
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;
|
|
CEMPNUM EMPMUM1 EMPNUM2
|
|
0.00 0 0.00
|
|
2.00 2 NULL
|
|
DROP TABLE t1,t2;
|
|
End of 4.1 tests
|
|
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;
|
|
a d
|
|
1 4572794622775114594
|
|
3 11120436154190595086
|
|
2 18196094287899841997
|
|
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;
|
|
a d
|
|
3 11120436154190595086
|
|
drop table t1, t2;
|
|
End of 5.0 tests
|
|
CREATE TABLE t1(a YEAR);
|
|
SELECT 1 FROM t1 WHERE a=1 AND CASE 1 WHEN a THEN 1 ELSE 1 END;
|
|
1
|
|
DROP TABLE t1;
|
|
create table t1 (f1 time);
|
|
insert t1 values ('00:00:00'),('00:01:00');
|
|
select case t1.f1 when '00:00:00' then 1 end from t1;
|
|
case t1.f1 when '00:00:00' then 1 end
|
|
1
|
|
NULL
|
|
drop table t1;
|
|
#
|
|
# MDEV-9745 Crash with CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END
|
|
#
|
|
CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
|
|
DESCRIBE t1;
|
|
Field Type Null Key Default Extra
|
|
a decimal(1,0) YES NULL
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
|
|
DESCRIBE t1;
|
|
Field Type Null Key Default Extra
|
|
a decimal(2,0) YES NULL
|
|
DROP TABLE t1;
|