drill

1e9930fb - DRILL-1192: Hive Scalar UDFs: Add Date, TimeStamp and Decimal type support

DRILL-1192: Hive Scalar UDFs: Add Date, TimeStamp and Decimal type support Also following refactoring: + Minimize the number of variables in HiveTypes.tdd + Make use of Hive TypeEntries and Hive AbstractPrimitiveObjectInspector to simplify Drill ObjectInspectors implementations. Test: + Add Hive UDF test implementations and testcases to cover all supported types (passing data into Hive UDF and reading data returned from Hive UDF).