DRILL-1701: Fix for nullable dictionary columns in optimized parquet reader. Re-enable the optimized reader for dictionary encoded files.
DRILL-1664: Count(*) returns incorrect result for a parquet file with repeated data.
DRILL-1700: Removed incorrect assertion in memory allocation code
DRILL-1635: Additional fix for validation exceptions.
DRILL-1720: Enable incremental maven builds
DRILL-1673: Set the correct group count in splitAndTransferTo for repeated vectors
Handle the case in FlattedRecordBatch where we return null internal vectors for repeated lists in the first schema batch
DRILL-1707: Don't push Filter past Project if the Project is producing ITEM expression (this is done as part of a new rule). Enable a few tests in TestProjectPushDown and TestExampleQueries that were marked Ignored earlier.