For use in java/avoiding trait bloat.
Use this with cross to create an exact match sub-portion of your query
This is for rollups: None means total sum, Some(q) is exact match
Query support for summingbird beyond Key-Value Q represents the query object L represents the logical input keys from your data X represents the expansion of logical keys (can't co variant because Set is not)
A query strategy for time with exponentially expanding buckets of time.
Factory methods and combinators on QueryStrategies