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cd89ed9ab6
not default_charset_into. It fixes the problem that in some cases numbers where treated as CHAR(N), not as BINARY(N), e.g. wrong 'charsetnr' when sent to the client side. 2. IFNULL didn't aggregate argument charsets and collations, so IFNULL(1,'a') produced a CHAR(N). Now produces a BINARY(N). 3. SELECT PROCEDURE ANALIZE now returns BINARY columns, which is much better than it worked previously: CHAR with the default character set. But in the future it's worth to fix the fields 'Field_name' and 'Optimal_fieldtype' to use UTF8, and 'Min_value' and 'Max_value' to inherit their charsets from the original items. But it is not important, and BINARY(N) is OK for now. 4. Tests were fixed accordingly. No new tests were made, as the old onces cover everything. mysql-test/r/analyse.result: SELECT PROCEDURE ANALIZE now returns BINARY columns, which is much better than it worked previously: CHAR with the default character set. But in the future it's worth to fix the fields 'Field_name' and 'Optimal_fieldtype' to use UTF8, and 'Min_value' and 'Max_value' to inherit their charsets from the original items. But it is not important, and BINARY(N) is OK for now. mysql-test/r/case.result: Test fix according to the changes mysql-test/r/metadata.result: Test fix according to the changes mysql-test/r/ps_1general.result: Test fix according to the changes mysql-test/r/ps_2myisam.result: Test fix according to the changes mysql-test/r/ps_3innodb.result: Test fix according to the changes mysql-test/r/ps_4heap.result: Test fix according to the changes mysql-test/r/ps_5merge.result: Test fix according to the changes mysql-test/r/ps_6bdb.result: Test fix according to the changes mysql-test/r/ps_7ndb.result: Test fix according to the changes mysql-test/r/union.result: Test fix according to the changes sql/item.cc: Item is now BINARY by default sql/item_cmpfunc.cc: IFNULL now collects arguments collations/charsets like other functions do.
156 lines
7.3 KiB
Text
156 lines
7.3 KiB
Text
drop table if exists t1;
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select CASE "b" when "a" then 1 when "b" then 2 END;
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CASE "b" when "a" then 1 when "b" then 2 END
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2
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select CASE "c" when "a" then 1 when "b" then 2 END;
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CASE "c" when "a" then 1 when "b" then 2 END
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NULL
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select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END;
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CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END
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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;
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CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END
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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;
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CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END
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ok
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select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end;
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CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end
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a
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select CASE when 1=0 then "true" else "false" END;
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CASE when 1=0 then "true" else "false" END
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false
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select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
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CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END
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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;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE 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 _latin1'one' when 2 then _latin1'two' else _latin1'more' end) AS `CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END`
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select CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END;
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CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END
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two
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select (CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0;
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(CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0
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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;
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(CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0
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2.00
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select case 1/0 when "a" then "true" else "false" END;
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case 1/0 when "a" then "true" else "false" END
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false
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select case 1/0 when "a" then "true" END;
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case 1/0 when "a" then "true" END
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NULL
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select (case 1/0 when "a" then "true" END) | 0;
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(case 1/0 when "a" then "true" END) | 0
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NULL
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select (case 1/0 when "a" then "true" END) + 0.0;
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(case 1/0 when "a" then "true" END) + 0.0
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NULL
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select case when 1>0 then "TRUE" else "FALSE" END;
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case when 1>0 then "TRUE" else "FALSE" END
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TRUE
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select case when 1<0 then "TRUE" else "FALSE" END;
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case when 1<0 then "TRUE" else "FALSE" END
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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 Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 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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;
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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` char(1) character set latin1 collate latin1_danish_ci NOT NULL default '',
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`c2` char(1) character set latin1 collate latin1_danish_ci NOT NULL default '',
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`c3` binary(1) NOT NULL default '',
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`c4` binary(1) NOT NULL default '',
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`c5` binary(3) NOT NULL default '',
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`c6` binary(3) NOT NULL default '',
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`c7` double(3,1) NOT NULL default '0.0',
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`c8` double(3,1) NOT NULL default '0.0',
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`c9` double(3,1) default NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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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,
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CASE _latin1'a' COLLATE latin1_bin WHEN _latin1'A' THEN '1' ELSE 2 END,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin THEN '1' ELSE 2 END
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;
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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
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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 Extra
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1 SIMPLE 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(_latin1'a') AS `COALESCE('a')`,coalesce(1,1.0) AS `COALESCE(1,1.0)`,coalesce(1,_latin1'1') AS `COALESCE(1,'1')`,coalesce(1.1,_latin1'1') AS `COALESCE(1.1,'1')`,coalesce((_latin1'a' collate _latin1'latin1_bin'),_latin1'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 default '0',
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`COALESCE(1.0)` double(3,1) NOT NULL default '0.0',
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`COALESCE('a')` char(1) NOT NULL default '',
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`COALESCE(1,1.0)` double(3,1) NOT NULL default '0.0',
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`COALESCE(1,'1')` binary(1) NOT NULL default '',
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`COALESCE(1.1,'1')` binary(3) NOT NULL default '',
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`COALESCE('a' COLLATE latin1_bin,'b')` char(1) character set latin1 collate latin1_bin NOT NULL default ''
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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DROP TABLE t1;
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