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removed wrong distinct UNION detection (BUG#6565)

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mysql-test/r/derived.result:
  test of union subquery in the FROM clause with complex distinct/all
mysql-test/t/derived.test:
  test of union subquery in the FROM clause with complex distinct/all
sql/sql_derived.cc:
  removed wrong distinct UNION detection
This commit is contained in:
unknown 2005-02-14 02:06:21 +02:00
parent 0d57871425
commit f048032c68
3 changed files with 39 additions and 2 deletions
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19
mysql-test/r/derived.result
View File

@ -339,3 +339,22 @@ select distinct sum(b) from (select a,b from t1) y group by a;
sum(b) sum(b)
4 4
drop table t1; drop table t1;
create table t1(a int);
create table t2(a int);
create table t3(a int);
insert into t1 values(1),(1);
insert into t2 values(2),(2);
insert into t3 values(3),(3);
select * from t1 union distinct select * from t2 union all select * from t3;
a
1
2
3
3
select * from (select * from t1 union distinct select * from t2 union all select * from t3) X;
a
1
2
3
3
drop table t1, t2, t3;

12
mysql-test/t/derived.test
View File

@ -224,3 +224,15 @@ select distinct sum(b) from t1 group by a;
select distinct sum(b) from (select a,b from t1) y group by a; select distinct sum(b) from (select a,b from t1) y group by a;
drop table t1; drop table t1;
#
# test of union subquery in the FROM clause with complex distinct/all (BUG#6565)
#
create table t1(a int);
create table t2(a int);
create table t3(a int);
insert into t1 values(1),(1);
insert into t2 values(2),(2);
insert into t3 values(3),(3);
select * from t1 union distinct select * from t2 union all select * from t3;
select * from (select * from t1 union distinct select * from t2 union all select * from t3) X;
drop table t1, t2, t3;

10
sql/sql_derived.cc
View File

@ -132,10 +132,16 @@ static int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
/* /*
Temp table is created so that it hounours if UNION without ALL is to be Temp table is created so that it hounours if UNION without ALL is to be
processed processed
As 'distinct' parameter we always pass FALSE (0), because underlying
query will control distinct condition by itself. Correct test of
distinct underlying query will be is_union &&
!unit->union_distinct->next_select() (i.e. it is union and last distinct
SELECT is last SELECT of UNION).
*/ */
if (!(table= create_tmp_table(thd, &derived_result->tmp_table_param, if (!(table= create_tmp_table(thd, &derived_result->tmp_table_param,
unit->types, (ORDER*) 0, unit->types, (ORDER*) 0,
is_union && unit->union_distinct, 1, FALSE, 1,
(first_select->options | thd->options | (first_select->options | thd->options |
TMP_TABLE_ALL_COLUMNS), TMP_TABLE_ALL_COLUMNS),
HA_POS_ERROR, HA_POS_ERROR,