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Proper handling of ORDER BY table.column in UNION's

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unknown
2002-12-02 20:18:51 +02:00
parent 36429430c6
commit 47af809c61
28 changed files with 39 additions and 13 deletions
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5
mysql-test/r/union.result
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@ -85,10 +85,7 @@ a b
2 b
1 a
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by t1.b;
a b
1 a
2 b
3 c
Table 't1' from one of SELECT's can not be used in order clause
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4

1
mysql-test/t/union.test
View File

@ -20,6 +20,7 @@ select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 g
(select a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 4;
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
--error 1248
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by t1.b;
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
#(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;