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correct table name assigned to temporary table field:

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- correct table name shown in EXPLAIN Iindex reference)
 - pointer on freed memmory (reallocation of table name in reusing table entry) can't be used in EXPLAIN
(BUG#1584)
This commit is contained in:
bell@sanja.is.com.ua
2003-10-19 14:25:33 +03:00
parent 2586a56be5
commit 9d294b869e
6 changed files with 35 additions and 21 deletions
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15
mysql-test/r/derived.result
View File

@ -215,3 +215,18 @@ ERROR 42000: You have an error in your SQL syntax. Check the manual that corres
insert into (select * from t1) values (5);
ERROR 42000: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '(select * from t1) values (5)' at line 1
drop table t1;
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
);
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;
count(*)
2
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;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2
1 PRIMARY t1 eq_ref PRIMARY PRIMARY 4 THEMAX.E2 1 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY B ALL NULL NULL NULL NULL 2 Using where
Warnings:
Note 1275 Field or reference 'A.E2' of SELECT #3 was resolved in SELECT #2
drop table t1;

7
mysql-test/r/subselect.result
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@ -1439,10 +1439,3 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using temporary; Using filesort
drop table t2, t3;
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
);
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;
count(*)
2
drop table t1;

10
mysql-test/t/derived.test
View File

@ -122,3 +122,13 @@ delete from (select * from t1);
-- error 1064
insert into (select * from t1) values (5);
drop table t1;
#
# deived tables with subquery inside all by one table
#
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
);
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;

9
mysql-test/t/subselect.test
View File

@ -965,12 +965,3 @@ insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
explain select * from t3 where a > all (select max(b) from t2 group by a);
drop table t2, t3;
#
# deived tables with subquery inside all by one table
#
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
);
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;
drop table t1;

8
sql/item.cc
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@ -272,11 +272,13 @@ Item_field::Item_field(Field *f) :Item_ident(NullS,f->table_name,f->field_name)
}
// Constructor need to process subselect with temporary tables (see Item)
Item_field::Item_field(THD *thd, Item_field &item):
Item_ident(thd, item),
Item_field::Item_field(THD *thd, Item_field &item)
:Item_ident(thd, item),
field(item.field),
result_field(item.result_field)
{ collation.set(DERIVATION_IMPLICIT); }
{
collation.set(DERIVATION_IMPLICIT);
}
void Item_field::set_field(Field *field_par)
{

3
sql/sql_select.cc
View File

@ -4866,6 +4866,9 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
recinfo->type=FIELD_NORMAL;
if (!--hidden_field_count)
null_count=(null_count+7) & ~7; // move to next byte
// fix table name in field entry
field->table_name= table->table_name;
}
param->copy_field_end=copy;