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MDEV-8871 Wrong result for CREATE TABLE .. SELECT LEAST(unsigned_column,unsigned_column)

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This commit is contained in:
Alexander Barkov
2015-09-30 10:05:16 +04:00
parent c13f4091f5
commit 09b87d6293
3 changed files with 80 additions and 2 deletions
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39
mysql-test/r/func_test.result
View File

@ -377,5 +377,44 @@ id k c pad
7 16 a xxx
DROP TABLE t1;
#
# MDEV-8871 Wrong result for CREATE TABLE .. SELECT LEAST(unsigned_column,unsigned_column)
#
CREATE TABLE t1 (a INT,b INT UNSIGNED);
INSERT INTO t1 VALUES (-2147483648,4294967295);
SELECT a, b, LEAST(a,a), LEAST(b,b), LEAST(a,b), LEAST(b,a), GREATEST(a,b), GREATEST(b,a) FROM t1;
a -2147483648
b 4294967295
LEAST(a,a) -2147483648
LEAST(b,b) 4294967295
LEAST(a,b) -2147483648
LEAST(b,a) -2147483648
GREATEST(a,b) 4294967295
GREATEST(b,a) 4294967295
CREATE TABLE t2 AS
SELECT a, b, LEAST(a,a), LEAST(b,b), LEAST(a,b), LEAST(b,a), GREATEST(a,b), GREATEST(b,a) FROM t1;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) DEFAULT NULL,
`b` int(10) unsigned DEFAULT NULL,
`LEAST(a,a)` int(11) DEFAULT NULL,
`LEAST(b,b)` int(10) unsigned DEFAULT NULL,
`LEAST(a,b)` decimal(10,0) DEFAULT NULL,
`LEAST(b,a)` decimal(10,0) DEFAULT NULL,
`GREATEST(a,b)` decimal(10,0) DEFAULT NULL,
`GREATEST(b,a)` decimal(10,0) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM t2;
a -2147483648
b 4294967295
LEAST(a,a) -2147483648
LEAST(b,b) 4294967295
LEAST(a,b) -2147483648
LEAST(b,a) -2147483648
GREATEST(a,b) 4294967295
GREATEST(b,a) 4294967295
DROP TABLE t2;
DROP TABLE t1;
#
# End of 10.1 tests
#

18
mysql-test/t/func_test.test
View File

@ -220,6 +220,24 @@ SELECT * FROM t1 WHERE id XOR 0;
SELECT * FROM t1 IGNORE KEY(PRIMARY) WHERE id XOR 0;
DROP TABLE t1;
--echo #
--echo # MDEV-8871 Wrong result for CREATE TABLE .. SELECT LEAST(unsigned_column,unsigned_column)
--echo #
CREATE TABLE t1 (a INT,b INT UNSIGNED);
INSERT INTO t1 VALUES (-2147483648,4294967295);
--vertical_results
SELECT a, b, LEAST(a,a), LEAST(b,b), LEAST(a,b), LEAST(b,a), GREATEST(a,b), GREATEST(b,a) FROM t1;
--horizontal_results
CREATE TABLE t2 AS
SELECT a, b, LEAST(a,a), LEAST(b,b), LEAST(a,b), LEAST(b,a), GREATEST(a,b), GREATEST(b,a) FROM t1;
SHOW CREATE TABLE t2;
--vertical_results
SELECT * FROM t2;
--horizontal_results
DROP TABLE t2;
DROP TABLE t1;
--echo #
--echo # End of 10.1 tests
--echo #

25
sql/item_func.cc
View File

@ -2823,11 +2823,13 @@ double Item_func_units::val_real()
void Item_func_min_max::fix_length_and_dec()
{
uint unsigned_count= 0;
int max_int_part=0;
decimals=0;
max_length=0;
maybe_null=0;
thd= current_thd;
compare_as_dates= find_date_time_item(args, arg_count, 0);
cmp_type=args[0]->result_type();
for (uint i=0 ; i < arg_count ; i++)
@ -2835,14 +2837,34 @@ void Item_func_min_max::fix_length_and_dec()
set_if_bigger(max_length, args[i]->max_length);
set_if_bigger(decimals, args[i]->decimals);
set_if_bigger(max_int_part, args[i]->decimal_int_part());
unsigned_count+= args[i]->unsigned_flag;
if (args[i]->maybe_null)
maybe_null= 1;
cmp_type= item_cmp_type(cmp_type,args[i]->result_type());
}
unsigned_flag= unsigned_count == arg_count; // if all args are unsigned
if (cmp_type == STRING_RESULT)
agg_arg_charsets_for_string_result_with_comparison(collation,
args, arg_count);
else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
else if (cmp_type == INT_RESULT)
{
collation.set_numeric();
fix_char_length(my_decimal_precision_to_length_no_truncation(max_int_part +
decimals,
decimals,
unsigned_flag));
if (unsigned_count != 0 && unsigned_count != arg_count)
{
/*
If all args are of INT-alike type, but have different unsigned_flag,
then change type to DECIMAL.
*/
cmp_type= DECIMAL_RESULT;
cached_field_type= MYSQL_TYPE_NEWDECIMAL;
return;
}
}
else if (cmp_type == DECIMAL_RESULT)
{
collation.set_numeric();
fix_char_length(my_decimal_precision_to_length_no_truncation(max_int_part +
@ -2853,7 +2875,6 @@ void Item_func_min_max::fix_length_and_dec()
else if (cmp_type == REAL_RESULT)
fix_char_length(float_length(decimals));
compare_as_dates= find_date_time_item(args, arg_count, 0);
if (compare_as_dates)
{
cached_field_type= compare_as_dates->field_type();