Wrong results with query using LIKE and ESCAPE clause that includes "%", "\",
and "_"
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Key: DERBY-1386
URL: http://issues.apache.org/jira/browse/DERBY-1386
Project: Derby
Type: Bug
Versions: 10.2.0.0, 10.1.2.5
Reporter: A B
After the fix for DERBY-1262 was checked in, I'm noticing that the following
query now returns different results. Prior to the fix for DERBY-1262 the query
returned 2 rows; now it doesn't return any rows.
create table escTable (c1 char(10));
insert into escTable values ('%_\a');
insert into escTable values ('%_b');
insert into escTable values ('%c');
insert into escTable values ('d');
insert into escTable values ('%_\e');
select c1 from escTable where c1 like '\%\_\\%' ESCAPE '\';
Before DERBY-1262, the SELECT returned:
C1
----------
%_\a
%_\e
2 rows selected
Now it returns:
C1
----------
0 rows selected
Brief inspection of the query and data suggest to me that these new results
(i.e. no rows) are wrong, and that Derby should in fact return 2 rows/.
Based on comments in DERBY-1262, I'm creating a new Jira issue for the
regression since it has been checked into the 10.1 maintenance branch. I've
set the priority to "Critical" since this could potentially delay a 10.1.3
release--I.e. I don't think we'd want to release 10.1.3 knowing that we have a
wrong results regression. But if anyone thinks that's not the correct
priority, feel free to speak up.
Other option, of course, is to back out the change for DERBY-1262 in 10.1 and
then lower the priority accordingly.
Input/feedback/comments would be appreciated.
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