DATE is a timezone-agnostic measure of the current date (without time of day) in YYYY-MM-DD form. The range of values typically supported is 0000-01-01 to 9999-12-31. Parquet has implemented DATE as a logical type mapped to int32, represented as the number of days since the start of the UNIX epoch (i.e. January 1, 1970).
Support for DATE is currently being added to Impala; we should also add support for it to Kudu.