Commit 8ebc9834 authored by Sinisa@sinisa.nasamreza.org's avatar Sinisa@sinisa.nasamreza.org
Browse files

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

parent c2f3ff66

mysql-test/r/case.result

+4 −0
Original line number Diff line number Diff line
@@ -40,3 +40,7 @@ fcase count(*) 
nothing	2

one	1

two	1

color

orange

yellow

green

mysql-test/t/case.test

+5 −0
Original line number Diff line number Diff line
@@ -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 "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;

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;

sql/item_cmpfunc.cc

+2 −0
Original line number Diff line number Diff line
@@ -687,6 +687,8 @@ String *Item_func_case::val_str(String *str) 
  }

  if (!(res=item->val_str(str)))

    null_value=1;

  else

    null_value=item->null_value;

  return res;

}

sql/sql_db.cc

+0 −2
Original line number Diff line number Diff line
@@ -371,8 +371,6 @@ bool mysql_change_db(THD *thd,const char *name) 
  }

  send_ok(&thd->net);

  x_free(thd->db);

  if (lower_case_table_names)

    casedn_str(dbname);

  thd->db=dbname;

  thd->db_access=db_access;

  DBUG_RETURN(0);