The old option name to enable Drill parquet reader is "store.hive.optimize_scan_with_native_readers".
DRILL-6454 one new native reader is introduced, therefore more precise option name is added for parquet native reader too.
A new option name for parquet reader is "store.hive.parquet.optimize_scan_with_native_reader".
The old one is deprecated and should be removed.
Since options are considered as API we can remove them only in major releases, i.e. in Drill 2.0.