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MDEV-8369 Unexpected impossible WHERE for a condition on a ZEROFILL field

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Disable IDENTITY_SUBST propagation for ZEROFILL columns,
as discussed with Sergei.
This commit is contained in:
Alexander Barkov
2015-09-11 15:41:53 +04:00
parent df9b8aee58
commit 9158212a27
12 changed files with 201 additions and 38 deletions
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48
mysql-test/r/func_weight_string.result
View File

@@ -92,3 +92,51 @@ Warnings:
Warning 1301 Result of cast_as_binary() was larger than max_allowed_packet (1048576) - truncated
Warning 1301 Result of weight_string() was larger than max_allowed_packet (1048576) - truncated
set global max_allowed_packet=default;
#
# Start of 10.1 tests
#
#
# MDEV-8369 Unexpected impossible WHERE for a condition on a ZEROFILL field
#
CREATE TABLE t1 (a INT(6) ZEROFILL);
INSERT INTO t1 VALUES (1),(2);
SELECT * FROM t1 WHERE a=1;
a
000001
SELECT * FROM t1 WHERE WEIGHT_STRING(a) IS NULL;
a
000001
000002
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
a
000001
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1) and isnull(weight_string(`test`.`t1`.`a`)))
ALTER TABLE t1 MODIFY a DOUBLE ZEROFILL;
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
a
0000000000000000000001
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1) and isnull(weight_string(`test`.`t1`.`a`)))
ALTER TABLE t1 MODIFY a DECIMAL(10,1) ZEROFILL;
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
a
000000001.0
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=1 AND WEIGHT_STRING(a) IS NULL;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1) and isnull(weight_string(`test`.`t1`.`a`)))
DROP TABLE t1;
#
# End of 10.1 tests
#