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after review changes
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bell@sanja.is.com.ua
@ -94,13 +94,13 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
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2 DERIVED t1 ALL NULL NULL NULL NULL 4
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3 UNION t1 ALL NULL NULL NULL NULL 4
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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explain select * from (select * from t1 union all select * from t1) a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8
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2 DERIVED t1 ALL NULL NULL NULL NULL 4
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3 UNION t1 ALL NULL NULL NULL NULL 4
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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CREATE TABLE t2 (a int not null);
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insert into t2 values(1);
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select * from (select * from t1 where t1.a=(select a from t2 where t2.a=t1.a)) a;
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@ -248,10 +248,10 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived4> ALL NULL NULL NULL NULL 2
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4 DERIVED t1 ALL NULL NULL NULL NULL 2
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5 UNION t1 ALL NULL NULL NULL NULL 2
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-4 UNION RESULT <union4> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union4,5> ALL NULL NULL NULL NULL NULL
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2 DERIVED t1 ALL NULL NULL NULL NULL 2
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3 UNION t1 ALL NULL NULL NULL NULL 2
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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drop table t1;
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CREATE TABLE `t1` (
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`N` int(11) unsigned NOT NULL default '0',
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@ -16,7 +16,7 @@ explain extended SELECT (SELECT 1) UNION SELECT (SELECT 2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1249 Select 2 was reduced during optimisation
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Note 1249 Select 4 was reduced during optimisation
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@ -29,7 +29,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
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4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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-3 UNION RESULT <union3> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1249 Select 2 was reduced during optimisation
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Note 1003 select (select 0 AS `0` union select 0 AS `0`) AS `(SELECT (SELECT 0 UNION SELECT 0))`
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@ -184,7 +184,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 Using filesort
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3 UNION t4 ALL NULL NULL NULL NULL 3 Using where; Using filesort
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4 SUBQUERY t2 ALL NULL NULL NULL NULL 2
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 where (test.t2.b = (select test.t3.a AS `a` from test.t3 order by test.t3.a desc limit 1))) union (select test.t4.a AS `a`,test.t4.b AS `b` from test.t4 where (test.t4.b = (select (max(test.t2.a) * 4) AS `max(t2.a)*4` from test.t2)) order by test.t4.a)
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select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
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@ -309,7 +309,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2
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2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1
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3 DEPENDENT UNION t5 ALL NULL NULL NULL NULL 2 Using where
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1276 Field or reference 't2.a' of SELECT #2 was resolved in SELECT #1
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Note 1276 Field or reference 't2.a' of SELECT #3 was resolved in SELECT #1
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@ -417,7 +417,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 index NULL topic 3 NULL 2 Using index
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2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 select 1 AS `1` from test.t1
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drop table t1;
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@ -732,7 +732,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 index NULL id 5 NULL 2 Using where; Using index
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2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
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3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 select test.t2.id AS `id` from test.t2 where <in_optimizer>(test.t2.id,<exists>(select 1 AS `Not_used` having (<cache>(test.t2.id) = <null_helper>(1)) union select 1 AS `Not_used` having (<cache>(test.t2.id) = <null_helper>(3))))
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SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3);
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@ -1547,7 +1547,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1
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2 SUBQUERY t1 system NULL NULL NULL NULL 1
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3 UNION t1 system NULL NULL NULL NULL 1
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-2 UNION RESULT <union2> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 select test.t1.s1 AS `s1` from test.t1
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drop table t1;
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@ -86,7 +86,7 @@ explain extended (select a,b from t1 limit 2) union all (select a,b from t2 ord
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4
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2 UNION t2 ALL NULL NULL NULL NULL 4 Using filesort
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL Using filesort
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using filesort
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Warnings:
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Note 1003 (select test.t1.a AS `a`,test.t1.b AS `b` from test.t1 limit 2) union all (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 order by test.t2.a limit 1) order by b desc
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(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
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@ -107,7 +107,7 @@ explain select a,b from t1 union all select a,b from t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 4
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2 UNION t2 ALL NULL NULL NULL NULL 4
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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explain select xx from t1 union select 1;
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ERROR 42S22: Unknown column 'xx' in 'field list'
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explain select a,b from t1 union select 1;
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@ -470,7 +470,7 @@ explain extended (select * from t1 where a=1) union (select * from t2 where a=1)
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
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2 UNION t2 const PRIMARY PRIMARY 4 const 1
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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Warnings:
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Note 1003 (select test.t1.a AS `a`,test.t1.b AS `b` from test.t1 where (test.t1.a = 1)) union (select test.t2.a AS `a`,test.t2.b AS `b` from test.t2 where (test.t2.a = 1))
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(select * from t1 where a=5) union (select * from t2 where a=1);
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@ -493,12 +493,12 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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2 UNION t1 index PRIMARY PRIMARY 4 NULL 4 Using index
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2 UNION t2 index PRIMARY PRIMARY 4 NULL 3 Using where; Using index
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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explain (select * from t1 where a=1) union (select * from t1 where b=1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
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2 UNION t1 ref b b 5 const 1 Using where
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-1 UNION RESULT <union1> ALL NULL NULL NULL NULL NULL
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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drop table t1,t2;
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create table t1 ( id int not null auto_increment, primary key (id) ,user_name text );
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create table t2 ( id int not null auto_increment, primary key (id) ,group_name text );
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