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Added test for Bug #11521

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"Negative integer keys incorrectly substituted for 0 during range analysis."

The problem is that the range optimizer incorrectly replaces any negative
constant with '0' for all types except BIGINT because the method save_in_field()
casts negative integers to non-negative. This causes incorrect query
results where (0 = any_negative_number).

The problem caused by this bug is fixed by the patch for BUG#11185.
That patch constitutes an optimization due to which the problem code is
never called with negative constants. This patch adds a test so we are sure
that the problem does not reappear.
This commit is contained in:
timour@mysql.com 2005-07-16 10:30:25 +03:00
parent c61ce0d90d
commit ff0c7f22cf
2 changed files with 23 additions and 0 deletions
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12
mysql-test/r/select.result
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@ -2570,3 +2570,15 @@ f2
1 1
NULL NULL
drop table t1,t2; drop table t1,t2;
create table t2 (a tinyint unsigned);
create index t2i on t2(a);
insert into t2 values (0), (254), (255);
explain select * from t2 where a > -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index t2i t2i 2 NULL 3 Using where; Using index
select * from t2 where a > -1;
a
0
254
255
drop table t2;

11
mysql-test/t/select.test
View File

@ -2127,3 +2127,14 @@ insert into t2 values (1,2,3),(2,4,6);
select A.f2 from t1 left join t2 A on A.f2 = f1 where A.f3=(select min(f3) select A.f2 from t1 left join t2 A on A.f2 = f1 where A.f3=(select min(f3)
from t2 C where A.f4 = C.f4) or A.f3 IS NULL; from t2 C where A.f4 = C.f4) or A.f3 IS NULL;
drop table t1,t2; drop table t1,t2;
#
# Bug #11521 Negative integer keys incorrectly substituted for 0 during
# range analysis.
create table t2 (a tinyint unsigned);
create index t2i on t2(a);
insert into t2 values (0), (254), (255);
explain select * from t2 where a > -1;
select * from t2 where a > -1;
drop table t2;