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fix for a bug in CASE ...WHEN ...

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Sinisa@sinisa.nasamreza.org 2002-12-16 22:16:57 +02:00
parent c2f3ff6630
commit 8ebc983442
4 changed files with 11 additions and 2 deletions
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4
mysql-test/r/case.result
View file

@ -40,3 +40,7 @@ fcase count(*)
nothing 2 nothing 2
one 1 one 1
two 1 two 1
color
orange
yellow
green

5
mysql-test/t/case.test
View file

@ -30,3 +30,8 @@ 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; 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; 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; drop table t1;
drop table if exists t;
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 if exists t;

2
sql/item_cmpfunc.cc
View file

@ -687,6 +687,8 @@ String *Item_func_case::val_str(String *str)
} }
if (!(res=item->val_str(str))) if (!(res=item->val_str(str)))
null_value=1; null_value=1;
else
null_value=item->null_value;
return res; return res;
} }

2
sql/sql_db.cc
View file

@ -371,8 +371,6 @@ bool mysql_change_db(THD *thd,const char *name)
} }
send_ok(&thd->net); send_ok(&thd->net);
x_free(thd->db); x_free(thd->db);
if (lower_case_table_names)
casedn_str(dbname);
thd->db=dbname; thd->db=dbname;
thd->db_access=db_access; thd->db_access=db_access;
DBUG_RETURN(0); DBUG_RETURN(0);