mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-17 20:42:30 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
another version of the fix.
Here i removed a loop that seems to be superfluous
This commit is contained in:
hf@deer.(none) 2003-11-08 16:43:16 +04:00
parent 8a41df536c
commit a88f4ea30f
3 changed files with 25 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

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;

31
sql/sql_lex.cc
View file

@ -1269,28 +1269,6 @@ bool st_select_lex::test_limit()
return(0);
}
/*
Interface method of table list creation for query
@ -1315,13 +1293,8 @@ bool st_select_lex_unit::create_total_list(THD *thd, st_lex *lex,
bool check_derived)
{
*result= 0;
for (SELECT_LEX_UNIT *unit= this; unit; unit= unit->next_unit())
{
if ((res= unit->create_total_list_n_last_return(thd, lex, &result,
check_derived)))
return res;
}
return 0;
res= create_total_list_n_last_return(thd, lex, &result, check_derived);
return res;
}
/*