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Fix for a bug with EXPLAIN and (....) UNION (....) order by

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Sinisa@sinisa.nasamreza.org
2002-04-02 20:08:55 +03:00
parent 2f7a8c0f04
commit b98a84a19f
3 changed files with 11 additions and 3 deletions
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5
mysql-test/r/union.result
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@ -84,6 +84,11 @@ a b
3 c
2 b
1 a
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
t2 ALL NULL NULL NULL NULL 4 Using filesort
t1 ALL NULL NULL NULL NULL 4
explain select a,b from t1 union all select a,b from t2;
table type possible_keys key key_len ref rows Extra
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;
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
# Test some error conditions with UNION
explain select a,b from t1 union all select a,b from t2;