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https://github.com/MariaDB/server.git
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577 lines
21 KiB
Text
577 lines
21 KiB
Text
drop table if exists t1, t2;
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select CASE "b" when "a" then 1 when "b" then 2 END as exp;
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exp
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2
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select CASE "c" when "a" then 1 when "b" then 2 END as exp;
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exp
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NULL
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select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END as exp;
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exp
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3
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select CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END as exp;
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exp
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ok
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select CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END as exp;
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exp
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ok
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select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end as exp;
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exp
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a
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select CASE when 1=0 then "true" else "false" END as exp;
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exp
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false
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select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END as exp;
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exp
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one
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explain extended select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END as exp;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select case 1 when 1 then 'one' when 2 then 'two' else 'more' end AS `exp`
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select CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END as exp;
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exp
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two
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select (CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0 as exp;
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exp
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2
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select (CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0 as exp;
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exp
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2.00
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select case 1/0 when "a" then "true" else "false" END as exp;
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exp
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false
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Warnings:
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Warning 1365 Division by 0
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select case 1/0 when "a" then "true" END as exp;
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exp
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NULL
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Warnings:
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Warning 1365 Division by 0
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select (case 1/0 when "a" then "true" END) | 0 as exp;
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exp
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NULL
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Warnings:
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Warning 1365 Division by 0
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select (case 1/0 when "a" then "true" END) + 0.0 as exp;
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exp
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NULL
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Warnings:
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Warning 1365 Division by 0
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select case when 1>0 then "TRUE" else "FALSE" END as exp;
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exp
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TRUE
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select case when 1<0 then "TRUE" else "FALSE" END as exp;
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exp
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FALSE
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create table t1 (a int);
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insert into t1 values(1),(2),(3),(4);
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select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
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fcase count(*)
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0 2
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2 1
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3 1
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explain extended select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 100.00 Using temporary; Using filesort
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Warnings:
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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
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select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
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fcase count(*)
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nothing 2
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one 1
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two 1
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drop table t1;
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create table t1 (row int not null, col int not null, val varchar(255) not null);
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insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
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select max(case col when 1 then val else null end) as color from t1 group by row;
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color
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orange
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yellow
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green
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drop table t1;
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SET NAMES latin1;
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CREATE TABLE t1 SELECT
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CASE WHEN 1 THEN _latin1'a' COLLATE latin1_danish_ci ELSE _latin1'a' END AS c1,
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CASE WHEN 1 THEN _latin1'a' ELSE _latin1'a' COLLATE latin1_danish_ci END AS c2,
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CASE WHEN 1 THEN 'a' ELSE 1 END AS c3,
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CASE WHEN 1 THEN 1 ELSE 'a' END AS c4,
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CASE WHEN 1 THEN 'a' ELSE 1.0 END AS c5,
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CASE WHEN 1 THEN 1.0 ELSE 'a' END AS c6,
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CASE WHEN 1 THEN 1 ELSE 1.0 END AS c7,
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CASE WHEN 1 THEN 1.0 ELSE 1 END AS c8,
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CASE WHEN 1 THEN 1.0 END AS c9,
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CASE WHEN 1 THEN 0.1e1 else 0.1 END AS c10,
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CASE WHEN 1 THEN 0.1e1 else 1 END AS c11,
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CASE WHEN 1 THEN 0.1e1 else '1' END AS c12
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;
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`c1` varchar(1) CHARACTER SET latin1 COLLATE latin1_danish_ci DEFAULT NULL,
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`c2` varchar(1) CHARACTER SET latin1 COLLATE latin1_danish_ci DEFAULT NULL,
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`c3` varchar(1) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`c4` varchar(1) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`c5` varchar(4) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`c6` varchar(4) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`c7` decimal(2,1) NOT NULL,
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`c8` decimal(2,1) NOT NULL,
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`c9` decimal(2,1) DEFAULT NULL,
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`c10` double NOT NULL,
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`c11` double NOT NULL,
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`c12` varchar(5) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
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DROP TABLE t1;
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SELECT CASE
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WHEN 1
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THEN _latin1'a' COLLATE latin1_danish_ci
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ELSE _latin1'a' COLLATE latin1_swedish_ci
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END;
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ERROR HY000: Illegal mix of collations (latin1_danish_ci,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'case'
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SELECT CASE _latin1'a' COLLATE latin1_general_ci
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WHEN _latin1'a' COLLATE latin1_danish_ci THEN 1
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WHEN _latin1'a' COLLATE latin1_swedish_ci THEN 2
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END;
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ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_danish_ci,EXPLICIT), (latin1_swedish_ci,EXPLICIT) for operation 'case'
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SELECT
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CASE _latin1'a' COLLATE latin1_general_ci WHEN _latin1'A' THEN '1' ELSE 2 END as e1,
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CASE _latin1'a' COLLATE latin1_bin WHEN _latin1'A' THEN '1' ELSE 2 END as e2,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END as e3,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin THEN '1' ELSE 2 END as e4
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;
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e1 e2 e3 e4
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1 2 1 2
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CREATE TABLE t1 SELECT COALESCE(_latin1'a',_latin2'a');
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ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'coalesce'
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CREATE TABLE t1 SELECT COALESCE('a' COLLATE latin1_swedish_ci,'b' COLLATE latin1_bin);
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ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'coalesce'
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CREATE TABLE t1 SELECT
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COALESCE(1), COALESCE(1.0),COALESCE('a'),
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COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
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COALESCE('a' COLLATE latin1_bin,'b');
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explain extended SELECT
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COALESCE(1), COALESCE(1.0),COALESCE('a'),
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COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
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COALESCE('a' COLLATE latin1_bin,'b');
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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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')`
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`COALESCE(1)` int(1) NOT NULL,
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`COALESCE(1.0)` decimal(2,1) NOT NULL,
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`COALESCE('a')` varchar(1) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`COALESCE(1,1.0)` decimal(2,1) NOT NULL,
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`COALESCE(1,'1')` varchar(1) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`COALESCE(1.1,'1')` varchar(4) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
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`COALESCE('a' COLLATE latin1_bin,'b')` varchar(1) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
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DROP TABLE t1;
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CREATE TABLE t1 SELECT IFNULL('a' COLLATE latin1_swedish_ci, 'b' COLLATE latin1_bin);
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ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'ifnull'
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SELECT 'case+union+test'
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UNION
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SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
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case+union+test
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case+union+test
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nobug
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SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
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CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END
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nobug
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SELECT 'case+union+test'
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UNION
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SELECT CASE '1' WHEN '2' THEN 'BUG' ELSE 'nobug' END;
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case+union+test
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case+union+test
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nobug
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create table t1(a float, b int default 3);
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insert into t1 (a) values (2), (11), (8);
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select min(a), min(case when 1=1 then a else NULL end),
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min(case when 1!=1 then NULL else a end)
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from t1 where b=3 group by b;
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min(a) min(case when 1=1 then a else NULL end) min(case when 1!=1 then NULL else a end)
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2 2 2
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drop table t1;
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CREATE TABLE t1 (EMPNUM INT);
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INSERT INTO t1 VALUES (0), (2);
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CREATE TABLE t2 (EMPNUM DECIMAL (4, 2));
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INSERT INTO t2 VALUES (0.0), (9.0);
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SELECT COALESCE(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
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t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
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FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
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CEMPNUM EMPMUM1 EMPNUM2
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0.00 0 0.00
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2.00 2 NULL
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SELECT IFNULL(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
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t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
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FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
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CEMPNUM EMPMUM1 EMPNUM2
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0.00 0 0.00
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2.00 2 NULL
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DROP TABLE t1,t2;
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End of 4.1 tests
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create table t1 (a int, b bigint unsigned);
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create table t2 (c int);
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insert into t1 (a, b) values (1,4572794622775114594), (2,18196094287899841997),
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(3,11120436154190595086);
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insert into t2 (c) values (1), (2), (3);
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select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
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join t2 on t1.a=t2.c order by d;
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a d
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1 4572794622775114594
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3 11120436154190595086
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2 18196094287899841997
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select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
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join t2 on t1.a=t2.c where b=11120436154190595086 order by d;
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a d
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3 11120436154190595086
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drop table t1, t2;
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End of 5.0 tests
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#
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# Bug#19875294 ASSERTION `SRC' FAILED IN MY_STRNXFRM_UNICODE
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# (SIG 6 -STRINGS/CTYPE-UTF8.C:5151)
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#
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set @@sql_mode='';
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CREATE TABLE t1(c1 SET('','')CHARACTER SET ucs2);
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Warnings:
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Note 1291 Column 'c1' has duplicated value '' in SET
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INSERT INTO t1 VALUES(990101.102);
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Warnings:
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Warning 1265 Data truncated for column 'c1' at row 1
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SELECT COALESCE(c1)FROM t1 ORDER BY 1;
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COALESCE(c1)
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DROP TABLE t1;
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set @@sql_mode=default;
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CREATE TABLE t1(a YEAR);
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SELECT 1 FROM t1 WHERE a=1 AND CASE 1 WHEN a THEN 1 ELSE 1 END;
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1
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DROP TABLE t1;
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create table t1 (f1 time);
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insert t1 values ('00:00:00'),('00:01:00');
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select case t1.f1 when '00:00:00' then 1 end from t1;
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case t1.f1 when '00:00:00' then 1 end
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1
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NULL
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drop table t1;
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#
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# MDEV-9745 Crash with CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END
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#
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CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 4 END AS a;
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DESCRIBE t1;
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Field Type Null Key Default Extra
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a decimal(1,0) YES NULL
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DROP TABLE t1;
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CREATE TABLE t1 SELECT CASE WHEN TRUE THEN COALESCE(CAST(NULL AS UNSIGNED)) ELSE 40 END AS a;
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DESCRIBE t1;
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Field Type Null Key Default Extra
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a decimal(2,0) YES NULL
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DROP TABLE t1;
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#
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# Start of 10.1 test
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#
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#
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# MDEV-8752 Wrong result for SELECT..WHERE CASE enum_field WHEN 1 THEN 1 ELSE 0 END AND a='5'
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#
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CREATE TABLE t1 (a ENUM('5','6') CHARACTER SET BINARY);
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INSERT INTO t1 VALUES ('5'),('6');
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SELECT * FROM t1 WHERE a='5';
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a
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5
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SELECT * FROM t1 WHERE a=1;
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a
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5
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SELECT * FROM t1 WHERE CASE a WHEN 1 THEN 1 ELSE 0 END;
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a
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5
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SELECT * FROM t1 WHERE CASE a WHEN 1 THEN 1 ELSE 0 END AND a='5';
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a
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5
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# Multiple comparison types in CASE, not Ok to propagate
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN 1 THEN 1 ELSE 0 END AND a='5';
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = '5' and case `test`.`t1`.`a` when 1 then 1 else 0 end
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DROP TABLE t1;
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CREATE TABLE t1 (a ENUM('a','b','100')) CHARSET=latin1;
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INSERT INTO t1 VALUES ('a'),('b'),('100');
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SELECT * FROM t1 WHERE a='a';
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a
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a
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SELECT * FROM t1 WHERE CASE a WHEN 'a' THEN 1 ELSE 0 END;
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a
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a
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SELECT * FROM t1 WHERE CASE a WHEN 'a' THEN 1 ELSE 0 END AND a='a';
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a
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a
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# String comparison in CASE and in the equality, ok to propagate
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN 'a' THEN 1 ELSE 0 END AND a='a';
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
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SELECT * FROM t1 WHERE a=3;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END AND a=3;
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a
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100
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# Integer comparison in CASE and in the equality, not ok to propagate
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# ENUM does not support this type of propagation yet.
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# This can change in the future. See MDEV-8748.
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END AND a=3;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where case `test`.`t1`.`a` when 3 then 1 else 0 end and `test`.`t1`.`a` = 3
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SELECT * FROM t1 WHERE a=3;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN '100' THEN 1 ELSE 0 END;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN '100' THEN 1 ELSE 0 END AND a=3;
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a
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100
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# String comparison in CASE, integer comparison in the equality, not Ok to propagate
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN '100' THEN 1 ELSE 0 END AND a=3;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where case `test`.`t1`.`a` when '100' then 1 else 0 end and `test`.`t1`.`a` = 3
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SELECT * FROM t1 WHERE a='100';
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END AND a='100';
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a
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100
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# Integer comparison in CASE, string comparison in the equality, not Ok to propagate
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 ELSE 0 END AND a='100';
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = '100' and case `test`.`t1`.`a` when 3 then 1 else 0 end
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SELECT * FROM t1 WHERE a='100';
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END;
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a
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100
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END AND a='100';
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a
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100
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# Multiple type comparison in CASE, string comparison in the equality, not Ok to propagate
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EXPLAIN EXTENDED
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SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END AND a='100';
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = '100' and case `test`.`t1`.`a` when 3 then 1 when '100' then 1 else 0 end
|
|
SELECT * FROM t1 WHERE a=3;
|
|
a
|
|
100
|
|
SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END;
|
|
a
|
|
100
|
|
SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END AND a=3;
|
|
a
|
|
100
|
|
# Multiple type comparison in CASE, integer comparison in the equality, not Ok to propagate
|
|
EXPLAIN EXTENDED
|
|
SELECT * FROM t1 WHERE CASE a WHEN 3 THEN 1 WHEN '100' THEN 1 ELSE 0 END AND a=3;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where case `test`.`t1`.`a` when 3 then 1 when '100' then 1 else 0 end and `test`.`t1`.`a` = 3
|
|
DROP TABLE t1;
|
|
#
|
|
# End of MDEV-8752
|
|
#
|
|
#
|
|
# End of 10.1 test
|
|
#
|
|
select case 'foo' when time'10:00:00' then 'never' when '0' then 'bug' else 'ok' end as exp;
|
|
exp
|
|
ok
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
select 'foo' in (time'10:00:00','0');
|
|
'foo' in (time'10:00:00','0')
|
|
0
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
create table t1 (a time);
|
|
insert t1 values (100000), (102030), (203040);
|
|
select case 'foo' when a then 'never' when '0' then 'bug' else 'ok' end from t1;
|
|
case 'foo' when a then 'never' when '0' then 'bug' else 'ok' end
|
|
ok
|
|
ok
|
|
ok
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
select 'foo' in (a,'0') from t1;
|
|
'foo' in (a,'0')
|
|
0
|
|
0
|
|
0
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
Warning 1292 Truncated incorrect time value: 'foo'
|
|
drop table t1;
|
|
select case '20:10:05' when date'2020-10-10' then 'never' when time'20:10:5' then 'ok' else 'bug' end as exp;
|
|
exp
|
|
ok
|
|
#
|
|
# End of 10.2 test
|
|
#
|
|
#
|
|
# MDEV-11554 Wrong result for CASE on a mixture of signed and unsigned expressions
|
|
#
|
|
CREATE TABLE t1 (a BIGINT, b BIGINT UNSIGNED);
|
|
INSERT INTO t1 VALUES (-9223372036854775808,18446744073709551615);
|
|
SELECT
|
|
CASE -1
|
|
WHEN -9223372036854775808 THEN 'one'
|
|
WHEN 18446744073709551615 THEN 'two'
|
|
END AS c;
|
|
c
|
|
NULL
|
|
PREPARE stmt FROM "SELECT
|
|
CASE -1
|
|
WHEN -9223372036854775808 THEN 'one'
|
|
WHEN 18446744073709551615 THEN 'two'
|
|
END AS c";
|
|
EXECUTE stmt;
|
|
c
|
|
NULL
|
|
EXECUTE stmt;
|
|
c
|
|
NULL
|
|
DEALLOCATE PREPARE stmt;
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-11555 CASE with a mixture of TIME and DATETIME returns a wrong result
|
|
#
|
|
SELECT
|
|
CASE TIME'10:20:30'
|
|
WHEN 102030 THEN 'one'
|
|
WHEN TIME'10:20:31' THEN 'two'
|
|
END AS good,
|
|
CASE TIME'10:20:30'
|
|
WHEN 102030 THEN 'one'
|
|
WHEN TIME'10:20:31' THEN 'two'
|
|
WHEN TIMESTAMP'2001-01-01 10:20:32' THEN 'three'
|
|
END AS was_bad_now_good;
|
|
good was_bad_now_good
|
|
one one
|
|
PREPARE stmt FROM "SELECT
|
|
CASE TIME'10:20:30'
|
|
WHEN 102030 THEN 'one'
|
|
WHEN TIME'10:20:31' THEN 'two'
|
|
END AS good,
|
|
CASE TIME'10:20:30'
|
|
WHEN 102030 THEN 'one'
|
|
WHEN TIME'10:20:31' THEN 'two'
|
|
WHEN TIMESTAMP'2001-01-01 10:20:32' THEN 'three'
|
|
END AS was_bad_now_good";
|
|
EXECUTE stmt;
|
|
good was_bad_now_good
|
|
one one
|
|
EXECUTE stmt;
|
|
good was_bad_now_good
|
|
one one
|
|
DEALLOCATE PREPARE stmt;
|
|
#
|
|
# MDEV-13864 Change Item_func_case to store the predicant in args[0]
|
|
#
|
|
SET NAMES latin1;
|
|
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1);
|
|
INSERT INTO t1 VALUES ('a'),('b'),('c');
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE a WHEN 'a' THEN 'a' ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN a THEN 'a' ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN 'a' THEN a ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a' and case 'a' when 'a' then `test`.`t1`.`a` else 'a' end = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN 'a' THEN 'a' ELSE a END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a' and case 'a' when 'a' then 'a' else `test`.`t1`.`a` end = 'a'
|
|
ALTER TABLE t1 MODIFY a VARBINARY(10);
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE a WHEN 'a' THEN 'a' ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN a THEN 'a' ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN 'a' THEN a ELSE 'a' END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN 'a' THEN 'a' ELSE a END='a';
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 'a'
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-17411 Wrong WHERE optimization with simple CASE and searched CASE
|
|
#
|
|
CREATE TABLE t1 (a INT, b INT, KEY(a));
|
|
INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
|
|
SELECT * FROM t1 WHERE CASE a WHEN b THEN 1 END=1;
|
|
a b
|
|
1 1
|
|
2 2
|
|
3 3
|
|
SELECT * FROM t1 WHERE CASE WHEN a THEN b ELSE 1 END=3;
|
|
a b
|
|
3 3
|
|
SELECT * FROM t1 WHERE
|
|
CASE a WHEN b THEN 1 END=1 AND
|
|
CASE WHEN a THEN b ELSE 1 END=3;
|
|
a b
|
|
3 3
|
|
EXPLAIN EXTENDED
|
|
SELECT * FROM t1 WHERE
|
|
CASE a WHEN b THEN 1 END=1 AND
|
|
CASE WHEN a THEN b ELSE 1 END=3;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
Warnings:
|
|
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where case `test`.`t1`.`a` when `test`.`t1`.`b` then 1 end = 1 and case when `test`.`t1`.`a` then `test`.`t1`.`b` else 1 end = 3
|
|
DROP TABLE t1;
|
|
#
|
|
# End of 10.3 test
|
|
#
|