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The initial implementation, started in HIVE-14217, focused on 1) enabling the discovery of data that is already stored in Druid from Hive, and 2) being able to query that data, trying to make use of Druid advanced querying capabilities. For instance, we put special emphasis on pushing as much computation as possible to Druid, and being able to recognize the type of queries for which Druid is specially efficient, e.g. timeseries or groupBy queries.

Future work after the first step is completed is being listed in HIVE-14473. If you want to collaborate on this effort, a list of remaining issues can be found at the end of this document.

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