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derived tables with UNION's ...

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Scrum task !!!!!


mysql-test/r/analyse.result:
  reverting a fix
mysql-test/r/derived.result:
  derived tables with UNION's ...
mysql-test/t/analyse.test:
  reverting a fix
mysql-test/t/derived.test:
  derived tables with UNION's ...
sql/mysql_priv.h:
  derived tables with UNION's ...
sql/sql_analyse.cc:
  reverting a fix
sql/sql_derived.cc:
  derived tables with UNION's ...
sql/sql_lex.cc:
  derived tables with UNION's ...
sql/sql_select.cc:
  derived tables with UNION's ...
sql/sql_union.cc:
  derived tables with UNION's ...
This commit is contained in:
unknown
2002-12-12 16:09:06 +02:00
parent 62ce900c2e
commit 657b311206
10 changed files with 68 additions and 74 deletions
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25
mysql-test/r/derived.result
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@ -63,6 +63,31 @@ a
select 1 from (select 1) as a;
1
1
select * from (select * from t1 union select * from t1) a;
a b
1 a
2 b
3 c
select * from (select * from t1 union all select * from t1) a;
a b
1 a
2 b
3 c
3 c
1 a
2 b
3 c
3 c
explain select * from (select * from t1 union select * from t1) a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
2 DERIVED t1 ALL NULL NULL NULL NULL 4
3 UNION t1 ALL NULL NULL NULL NULL 4
explain select * from (select * from t1 union all select * from t1) a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8
2 DERIVED t1 ALL NULL NULL NULL NULL 4
3 UNION t1 ALL NULL NULL NULL NULL 4
drop table if exists t1;
create table t1(a int not null, t char(8), index(a));
SELECT * FROM (SELECT * FROM t1) as b ORDER BY a ASC LIMIT 0,20;