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Fix for bug #1727 ( Crash in EXPLAIN & UNION & derived)

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another version of the fix.
Here i removed a loop that seems to be superfluous


mysql-test/r/derived.result:
  appropriate test result added
mysql-test/t/derived.test:
  test case for the bug 1727
sql/sql_lex.cc:
  we don't need loop here
This commit is contained in:
unknown
2003-11-08 16:43:16 +04:00
parent b036800ee0
commit e2661bdbba
3 changed files with 25 additions and 29 deletions
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17
mysql-test/r/derived.result
View File

@ -228,3 +228,20 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DERIVED t1 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 2 Using where
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2);
select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
a a
1 1
2 1
1 2
2 2
explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2
1 PRIMARY <derived4> ALL NULL NULL NULL NULL 2
4 DERIVED t1 ALL NULL NULL NULL NULL 2
5 UNION t1 ALL NULL NULL NULL NULL 2
2 DERIVED t1 ALL NULL NULL NULL NULL 2
3 UNION t1 ALL NULL NULL NULL NULL 2
drop table t1;

6
mysql-test/t/derived.test
View File

@ -132,3 +132,9 @@ insert into t1 VALUES(1,1,1), (2,2,1);
select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2);
select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
drop table t1;