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COALESCE now aggregates its argument types in this way:

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if some of the arguments is STRING_RESULT the STRING_RESULT
else if some of the arguments is REAL_RESULT then REAL_RESULT
else INT_RESULT
This commit is contained in:
unknown
2003-07-14 19:28:36 +05:00
parent e7360f4989
commit 6b001731c1
3 changed files with 49 additions and 0 deletions
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21
mysql-test/r/case.result
View File

@@ -71,3 +71,24 @@ orange
yellow yellow
green green
drop table t1; drop table t1;
SET NAMES latin1;
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');
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`COALESCE(1)` int(1) NOT NULL default '0',
`COALESCE(1.0)` double(3,1) NOT NULL default '0.0',
`COALESCE('a')` char(1) NOT NULL default '',
`COALESCE(1,1.0)` double(3,1) NOT NULL default '0.0',
`COALESCE(1,'1')` char(1) NOT NULL default '',
`COALESCE(1.1,'1')` char(3) NOT NULL default '',
`COALESCE('a' COLLATE latin1_bin,'b')` char(1) character set latin1 collate latin1_bin NOT NULL default ''
) TYPE=MyISAM CHARSET=latin1
DROP TABLE t1;

22
mysql-test/t/case.test
View File

@@ -41,3 +41,25 @@ 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'); 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; select max(case col when 1 then val else null end) as color from t1 group by row;
drop table t1; drop table t1;
#
# 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
SET NAMES latin1;
--error 1265
CREATE TABLE t1 SELECT COALESCE(_latin1'a',_latin2'a');
--error 1265
CREATE TABLE t1 SELECT COALESCE('a' COLLATE latin1_swedish_ci,'b' COLLATE latin1_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 latin1_bin,'b');
SHOW CREATE TABLE t1;
DROP TABLE t1;

6
sql/item_cmpfunc.cc
View File

@@ -1149,7 +1149,13 @@ void Item_func_coalesce::fix_length_and_dec()
{ {
set_if_bigger(max_length,args[i]->max_length); set_if_bigger(max_length,args[i]->max_length);
set_if_bigger(decimals,args[i]->decimals); set_if_bigger(decimals,args[i]->decimals);
cached_result_type=item_store_type(cached_result_type,
args[i]->result_type());
} }
if (cached_result_type == STRING_RESULT)
agg_arg_collations(collation, args, arg_count);
else if (cached_result_type != REAL_RESULT)
decimals= 0;
} }
/**************************************************************************** /****************************************************************************