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Fix for bug#5088:

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* When executing EXPLAIN, do the same as for the query: convert join type to JT_CONST if keyuse array covers all key parts and all of them are constants.
 * In remove_const, don't remove conditions that depend on some-const-table and current-table.
This commit is contained in:
sergefp@mysql.com 2004-08-23 12:31:56 +04:00
parent f0fffbe21b
commit 263f2e3fe2
3 changed files with 124 additions and 3 deletions
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71
mysql-test/r/join_outer.result
View file

@ -634,7 +634,7 @@ insert into t2 values (10,1),(20,2),(30,3);
explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 4 NULL 3 Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 2 const 1 Using where; Using index
1 SIMPLE t1 const PRIMARY PRIMARY 2 const 1 Using where; Using index
select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
fooID barID fooID
10 1 NULL
@ -682,3 +682,72 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
drop table t1, t2, t3;
create table t1 (
match_id tinyint(3) unsigned not null auto_increment,
home tinyint(3) unsigned default '0',
unique key match_id (match_id),
key match_id_2 (match_id)
);
insert into t1 values("1", "2");
create table t2 (
player_id tinyint(3) unsigned default '0',
match_1_h tinyint(3) unsigned default '0',
key player_id (player_id)
);
insert into t2 values("1", "5");
insert into t2 values("2", "9");
insert into t2 values("3", "3");
insert into t2 values("4", "7");
insert into t2 values("5", "6");
insert into t2 values("6", "8");
insert into t2 values("7", "4");
insert into t2 values("8", "12");
insert into t2 values("9", "11");
insert into t2 values("10", "10");
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by m.match_id desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
player_id match_1_h * match_id home UUX
8 12 * 1 2 10
9 11 * 1 2 9
10 10 * 1 2 8
2 9 * 1 2 7
6 8 * 1 2 6
4 7 * 1 2 5
5 6 * 1 2 4
1 5 * 1 2 3
7 4 * 1 2 2
3 3 * 1 2 1
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
player_id match_1_h * match_id home UUX
8 12 * 1 2 10
9 11 * 1 2 9
10 10 * 1 2 8
2 9 * 1 2 7
6 8 * 1 2 6
4 7 * 1 2 5
5 6 * 1 2 4
1 5 * 1 2 3
7 4 * 1 2 2
3 3 * 1 2 1
drop table t1, t2;

50
mysql-test/t/join_outer.test
View file

@ -451,3 +451,53 @@ select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is
explain select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null;
drop table t1, t2, t3;
# Test for BUG#5088
create table t1 (
match_id tinyint(3) unsigned not null auto_increment,
home tinyint(3) unsigned default '0',
unique key match_id (match_id),
key match_id_2 (match_id)
);
insert into t1 values("1", "2");
create table t2 (
player_id tinyint(3) unsigned default '0',
match_1_h tinyint(3) unsigned default '0',
key player_id (player_id)
);
insert into t2 values("1", "5");
insert into t2 values("2", "9");
insert into t2 values("3", "3");
insert into t2 values("4", "7");
insert into t2 values("5", "6");
insert into t2 values("6", "8");
insert into t2 values("7", "4");
insert into t2 values("8", "12");
insert into t2 values("9", "11");
insert into t2 values("10", "10");
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by m.match_id desc;
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
drop table t1, t2;

6
sql/sql_select.cc
View file

@ -3215,6 +3215,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
store_key **ref_key= j->ref.key_copy;
byte *key_buff=j->ref.key_buff, *null_ref_key= 0;
bool keyuse_uses_no_tables= true;
if (ftkey)
{
j->ref.items[0]=((Item_func*)(keyuse->val))->key_item();
@ -3234,6 +3235,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
uint maybe_null= test(keyinfo->key_part[i].null_bit);
j->ref.items[i]=keyuse->val; // Save for cond removal
keyuse_uses_no_tables= keyuse_uses_no_tables & !keyuse->used_tables;
if (!keyuse->used_tables &&
!(join->select_options & SELECT_DESCRIBE))
{ // Compare against constant
@ -3273,7 +3275,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
j->type= null_ref_key ? JT_REF_OR_NULL : JT_REF;
j->ref.null_ref_key= null_ref_key;
}
else if (ref_key == j->ref.key_copy)
else if (keyuse_uses_no_tables)
{
/*
This happen if we are using a constant expression in the ON part
@ -4062,7 +4064,7 @@ remove_const(JOIN *join,ORDER *first_order, COND *cond, bool *simple_order)
}
if ((ref=order_tables & (not_const_tables ^ first_table)))
{
if (only_eq_ref_tables(join,first_order,ref))
if (!(order_tables & first_table) && only_eq_ref_tables(join,first_order,ref))
{
DBUG_PRINT("info",("removing: %s", order->item[0]->full_name()));
continue;