filter statement question

[Travis Crawford]

Hey HCat gurus -

I'm having an issue getting range filters working and am curious if what
I'm trying to do makes sense. When filtering for explicit partitions (even
multiple explicit partitions) things work as expected. However, when
requesting a range it fails with a TTransportException.

data = LOAD 'db.table' USING org.apache.hcatalog.pig.HCatLoader();

-- filter statements that work
f = FILTER data BY part_dt == '20120313T000000Z';
f = FILTER data BY part_dt == '20120313T000000Z'
                OR part_dt == '20120313T010000Z';

-- filter statements that do not work
f = FILTER data BY part_dt >= '20120313T000000Z';
f = FILTER data BY part_dt >= '20120313T000000Z'
               AND part_dt < '20120313T010000Z';

When things are working correctly would you expect all four of these filter
statements to be valid?

Thanks!
Travis