MySQL Bugs: #6787: LIKE not working properly with

Bug #6787	LIKE not working properly with _ and utf8 data
Submitted:	24 Nov 2004 1:22	Modified:	24 Nov 2004 16:11
Reporter:	Matthew Lord	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S1 (Critical)
Version:	4.1.7	OS:	Any (all)
Assigned to:	Alexander Barkov	CPU Architecture:	Any

Description:
LIKE "\_%" matches all rows in a table

How to repeat:
use test;

create table liketest ( name varchar(20) ) default charset=utf8;

insert into liketest values ('matt'), ('lilu'), ('_carly'), ('sidney'), ('_hoppie');

select * from liketest where name like "\_%";

Suggested fix:
Only return the correctly matching rows.

I was able to verify this on windows 2000 (Service Pack 4), Linux (2.4.21 #12 SMP Thu Aug 
14 00:49:40 EDT 2003 i686 i686 i386 GNU/Linux) and Solaris 9 (64 bit).

Note, this worked fine in 4.1 up until 4.1.7.  There was a late change made shortly before the 
release of 4.1.7 because a BK build that I did not too long before the release was done does
not exhibit the problem.  I also did a BK build of 4.1.8 today, 11/23, and it still has the problem.

Prepending another % sign seems to make it work correctly:
select * from liketest where name like "%\_%";

Another note, the results are the same whether the table is an innodb table or a myisam table.

Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html

Additional info:

fixed in 4.1.8

I am running version 5.0.27 and I am having this problem

Kyle, I can't reproduce this proble with 5.0.x.
Can you please post a "how to repeat" instruction?
Thanks!