drill

0f8cccb3 - - Add queue feature to support encoding as UnbackedRecord rather than JSON encoded byte arrays.

- Add queue feature to support encoding as UnbackedRecord rather than JSON encoded byte arrays. - Add additional tool to TestUtils to get a set of unbacked records from example logical plan - Fix for DRILL-61: Correcting the offset of the carryover values - Add test for DRILL-61 bug - Fix for DRILL-66: Add support for nullCollation: <first | last> - Add tests for DRILL-66 functionality