Parethesis don't work correctly in where clause

Your name         :  Casey Allen Shobe
Your email address:  cshobe@secureworks.com

System Configuration
---------------------
  Architecture (example: Intel Pentium)         :  Intel Pentium III 1GHz
  Operating System (example: Linux 2.0.26 ELF)  :  Linux 2.4.20
  PostgreSQL version (example: PostgreSQL-6.4.2):  PostgreSQL-7.3.2
  Compiler used (example:  gcc 2.8.0)           :  gcc 3.2.2
      $CC environment variable                  :  gcc -s
      $CFLAGS environment variable              :  -O3 -mcpu=i686

Please enter a FULL description of your problem:
------------------------------------------------
I have a query with:
where "n"."revision" = 2

If I add:
and (
    "t"."name" = 'nibc'
and    "n"."identifier" = 12345
)
...it works.

If I add:
and (
    "t"."name" = 'client'
and    "n"."identifier" = 123
)
instead of the previous...it also works as expected.

However, if I add:
and (
        "t"."name" = 'nibc'
    and    "n"."identifier" = 1274
) or (
        "t"."name" = 'client'
    and    "n"."identifier" = 383
)
PostgreSQL returns only the revision 2 tuple for nibc 1274, but also a
revision 1 tuple for client 383.  ONLY things matching revision 2 should be
found, but for some reason the "n"."revision" = 2 isn't being applied
globally, but only to the first set of parenthesis.

This workaround makes it work:
where (
        "t"."name" = 'nibc'
    and    "n"."identifier" = 1274
    and    "n"."revision" = 2
) or (
        "t"."name" = 'client'
    and    "n"."identifier" = 383
    and    "n"."revision" = 2
)
...but that can get horribly repetitive after a while.

Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
----------------------------------------------------------------------

See above SQL.  Apply to any table.

If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------

By correctly keeping the global "n"."revision" defined outside of the
parenthases in a global state.

--
Casey Allen Shobe, Developer & Linux Administrator
SecureWorks, Inc. / 404.327.6339 x169 / Fax: 404.728.0144
cshobe@secureworks.net / http://www.secureworks.net

00001110 is good for the soul.