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Bug#20836 Selecting into variables results in wrong results being returned

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This error is displayed anytime the SELECT statement needs a temp table to
return correct results because the object (select_dumpvar) that represents
variables named in the INTO clause stored the results before the temp
table was considered.  The problem was fixed by creating the necessary
Item_func_set_user_var objects once the correct data is ready.


mysql-test/r/distinct.result:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Added results
mysql-test/t/distinct.test:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Added various Selects that use the INTO statement and a temp table.
  - Added Select Into Outfile variant tests also.
sql/sql_class.cc:
  Bug#20836 Selecting into variables results in wrong results being returned
  - The select_dumpvar variable created a Item_func_set_user_var too early
  and once set, it was not possible to change.  The Item_func_set_user_var
  is now created once the final results are available.
sql/sql_class.h:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Removed unnecessary object members.
This commit is contained in:
unknown 2006-11-28 17:21:39 -05:00
parent 870b2e0a2b
commit b4aab15272
4 changed files with 147 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
mysql-test/r/distinct.result
View File

@ -566,3 +566,62 @@ a b
3 2
2 3
DROP TABLE t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
INSERT INTO t1 VALUES (1,1,'ORANGE');
INSERT INTO t1 VALUES (2,2,'APPLE');
INSERT INTO t1 VALUES (3,2,'APPLE');
INSERT INTO t1 VALUES (4,3,'PEAR');
SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v1, @v2;
@v1 @v2
2 APPLE
SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id,
fruit_name HAVING fruit_name = 'APPLE';
SELECT @v3, @v4;
@v3 @v4
2 APPLE
SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE
fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8;
@v5 @v6 @v7 @v8
2 APPLE 2 APPLE
SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1
WHERE fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8, @v9, @v10;
@v5 @v6 @v7 @v8 @v9 @v10
2 APPLE 2 APPLE 4 APPLEAPPLE
SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO
@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v11, @v12, @v13, @v14;
@v11 @v12 @v13 @v14
4 APPLEAPPLE 4 APPLEAPPLE
SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v15, @v16;
@v15 @v16
4 APPLEAPPLE
SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v17, @v18;
@v17 @v18
4 Bob
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE
'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE
'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
SELECT @v19, @v20;
@v19 @v20
2 APPLE
SELECT * FROM t2;
fruit_id fruit_name
2 APPLE
2 APPLE
DROP TABLE t1;
DROP TABLE t2;

65
mysql-test/t/distinct.test
View File

@ -389,4 +389,69 @@ explain SELECT DISTINCT a, b FROM t1 ORDER BY b;
SELECT DISTINCT a, b FROM t1 ORDER BY b;
DROP TABLE t1;
#
#Bug #20836: Selecting into variables results in wrong results being returned
#
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
INSERT INTO t1 VALUES (1,1,'ORANGE');
INSERT INTO t1 VALUES (2,2,'APPLE');
INSERT INTO t1 VALUES (3,2,'APPLE');
INSERT INTO t1 VALUES (4,3,'PEAR');
SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v1, @v2;
SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id,
fruit_name HAVING fruit_name = 'APPLE';
SELECT @v3, @v4;
SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE
fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8;
SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1
WHERE fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8, @v9, @v10;
SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO
@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v11, @v12, @v13, @v14;
SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v15, @v16;
SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v17, @v18;
--disable_warnings
DROP TABLE IF EXISTS t2;
--enable_warnings
CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE
'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
--exec rm $MYSQL_TEST_DIR/var/tmp/data1.tmp
SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE
'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
--exec rm $MYSQL_TEST_DIR/var/tmp/data2.tmp
SELECT @v19, @v20;
SELECT * FROM t2;
DROP TABLE t1;
DROP TABLE t2;
# End of 4.1 tests

48
sql/sql_class.cc
View File

@ -1372,37 +1372,20 @@ bool select_exists_subselect::send_data(List<Item> &items)
int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
List_iterator_fast<Item> li(list);
List_iterator_fast<LEX_STRING> gl(var_list);
Item *item;
LEX_STRING *ls;
unit= u;
if (var_list.elements != list.elements)
{
my_error(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT, MYF(0));
return 1;
}
unit=u;
while ((item=li++))
{
ls= gl++;
Item_func_set_user_var *xx = new Item_func_set_user_var(*ls,item);
/*
Item_func_set_user_var can't substitute something else on its place =>
0 can be passed as last argument (reference on item)
*/
xx->fix_fields(thd,(TABLE_LIST*) thd->lex->select_lex.table_list.first,
0);
xx->fix_length_and_dec();
vars.push_back(xx);
}
return 0;
}
void select_dumpvar::cleanup()
{
vars.empty();
row_count=0;
row_count= 0;
}
@ -1744,12 +1727,14 @@ Statement_map::~Statement_map()
bool select_dumpvar::send_data(List<Item> &items)
{
List_iterator_fast<Item_func_set_user_var> li(vars);
Item_func_set_user_var *xx;
List_iterator_fast<LEX_STRING> var_li(var_list);
List_iterator<Item> it(items);
Item *item;
LEX_STRING *ls;
DBUG_ENTER("send_data");
if (unit->offset_limit_cnt)
{ // Using limit offset,count
{ // using limit offset,count
unit->offset_limit_cnt--;
DBUG_RETURN(0);
}
@ -1758,10 +1743,21 @@ bool select_dumpvar::send_data(List<Item> &items)
my_error(ER_TOO_MANY_ROWS, MYF(0));
DBUG_RETURN(1);
}
while ((xx=li++))
while ((ls= var_li++) && (item= it++))
{
xx->check();
xx->update();
Item_func_set_user_var *suv= new Item_func_set_user_var(*ls, item);
/*
Item_func_set_user_var can't substitute something else on its
place => NULL may be passed as last argument (reference on
item) Item_func_set_user_var can't be fixed after creation, so
we do not check var->fixed
*/
suv->fix_fields(thd, (TABLE_LIST *) thd->lex->select_lex.table_list.first,
0);
suv->check();
suv->update();
}
DBUG_RETURN(0);
}

3
sql/sql_class.h
View File

@ -1573,8 +1573,7 @@ class select_dumpvar :public select_result_interceptor {
ha_rows row_count;
public:
List<LEX_STRING> var_list;
List<Item_func_set_user_var> vars;
select_dumpvar(void) { var_list.empty(); vars.empty(); row_count=0;}
select_dumpvar() { var_list.empty(); row_count= 0;}
~select_dumpvar() {}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_data(List<Item> &items);