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Bug#11766270 59343: YEAR(4): INCORRECT RESULT AND VALGRIND WARNINGS WITH MIN/MAX, UNION

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When we create temporary result table for UNION
incorrect max_length for YEAR field is used and
it leads to incorrect field value and incorrect
result string length as YEAR field value calculation
depends on field length.
The fix is to use underlying item max_length for
Item_sum_hybrid::max_length intialization.


mysql-test/r/func_group.result:
  test case
mysql-test/t/func_group.test:
  test case
sql/field.cc:
  added assert
sql/item_sum.cc:
  init Item_sum_hybrid::max_length with 
  use underlying item max_length for
  INT result type.
This commit is contained in:
Sergey Glukhov 2011-04-12 14:01:33 +04:00
parent 33c2a5e7e3
commit 7fa7a0cad9
4 changed files with 26 additions and 5 deletions
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11
mysql-test/r/func_group.result
View file

@ -1746,4 +1746,15 @@ MAX(LENGTH(a)) LENGTH(MAX(a)) MIN(a) MAX(a) CONCAT(MIN(a)) CONCAT(MAX(a))
20 20 18446668621106209655 18446668621106209655 18446668621106209655 18446668621106209655
DROP TABLE t1;
#
# Bug #11766270 59343: YEAR(4): INCORRECT RESULT AND VALGRIND WARNINGS WITH MIN/MAX, UNION
#
CREATE TABLE t1(f1 YEAR(4));
INSERT INTO t1 VALUES (0000),(2001);
(SELECT MAX(f1) FROM t1) UNION (SELECT MAX(f1) FROM t1);
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def MAX(f1) MAX(f1) 13 4 4 Y 32864 0 63
MAX(f1)
2001
DROP TABLE t1;
#
End of 5.1 tests

12
mysql-test/t/func_group.test
View file

@ -1127,6 +1127,18 @@ INSERT INTO t1 VALUES (18446668621106209655);
SELECT MAX(LENGTH(a)), LENGTH(MAX(a)), MIN(a), MAX(a), CONCAT(MIN(a)), CONCAT(MAX(a)) FROM t1;
DROP TABLE t1;
--echo #
--echo # Bug #11766270 59343: YEAR(4): INCORRECT RESULT AND VALGRIND WARNINGS WITH MIN/MAX, UNION
--echo #
CREATE TABLE t1(f1 YEAR(4));
INSERT INTO t1 VALUES (0000),(2001);
--enable_metadata
(SELECT MAX(f1) FROM t1) UNION (SELECT MAX(f1) FROM t1);
--disable_metadata
DROP TABLE t1;
--echo #
--echo End of 5.1 tests

2
sql/field.cc
View file

@ -5467,6 +5467,7 @@ double Field_year::val_real(void)
longlong Field_year::val_int(void)
{
ASSERT_COLUMN_MARKED_FOR_READ;
DBUG_ASSERT(field_length == 2 || field_length == 4);
int tmp= (int) ptr[0];
if (field_length != 4)
tmp%=100; // Return last 2 char
@ -5479,6 +5480,7 @@ longlong Field_year::val_int(void)
String *Field_year::val_str(String *val_buffer,
String *val_ptr __attribute__((unused)))
{
DBUG_ASSERT(field_length < 5);
val_buffer->alloc(5);
val_buffer->length(field_length);
char *to=(char*) val_buffer->ptr();

6
sql/item_sum.cc
View file

@ -612,17 +612,13 @@ Item_sum_hybrid::fix_fields(THD *thd, Item **ref)
switch (hybrid_type= item->result_type()) {
case INT_RESULT:
max_length= 20;
break;
case DECIMAL_RESULT:
case STRING_RESULT:
max_length= item->max_length;
break;
case REAL_RESULT:
max_length= float_length(decimals);
break;
case STRING_RESULT:
max_length= item->max_length;
break;
case ROW_RESULT:
default:
DBUG_ASSERT(0);