Bug #480: problem with LIKE pattern matches involving % and \_

Tom Cross (decius@whack.org) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
problem with LIKE pattern matches involving % and \_

Long Description
The following pattern matches do not work:

LIKE '%\_%'
LIKE '%\_'
LIKE '\_%'

They seem to match everything even if it does not contain an underscore. There seems to be no problem if another
character 
is involved somehow, such as LIKE '\_b%'

I'm running 7.1.3...



Sample Code
somedatabase=# select * from tom;
   stuff
-----------
 blah
 blah_
 _blah
 blah_blah
(4 rows)

somedatabase=# select * from tom where stuff LIKE '%\_%';
   stuff
-----------
 blah
 blah_
 _blah
 blah_blah
(4 rows)

somedatabase=# select * from tom where stuff LIKE '\_%';
   stuff
-----------
 blah
 blah_
 _blah
 blah_blah
(4 rows)

somedatabase=# select * from tom where stuff LIKE '%h\_%';
  stuff
-----------
 blah_
 blah_blah
(2 rows)


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