Add unit tests for rc binary and rc text
Adding json_array_get function and tests
Refactor HiveRecordSet to make it easier to extend with new file formats
Add support for DISTINCT in aggregations for simple cases

Supports COUNT(DISTINCT) and DISTINCT in other aggregations, as long as
there is only one DISTINCT expression, and all the aggregations use this
expression. Also, using it with GROUP BY is not supported yet.
Add a summarized print of TableScanNode TupleDomain to cut down on logging size
Documentation for SHOW CATALOGS
Prune the table scan assignments just before plan finalization
Set no more buffers for hash distributed node