I've created the following jira HAWQ-866 <https://issues.apache.org/jira/browse/HAWQ-886> which is focussed on improving/enhancing the existing PXF profile to read ORC files. The goal is to make use of the underlying ORC reader's capability of supporting predicate push-down among others.
Presto has also contributed an alternative ORC reader which provides both predicate push down and Lazy reads https://code.facebook.com/posts/370832626374903/even-faster-data-at-the-speed-of-presto-orc/ . Will be evaluating both the options as part of this effort. -- shivram mani
