jon-wei commented on issue #9419: SQL: top-level sketch functions do not return sketches URL: https://github.com/apache/druid/issues/9419#issuecomment-594162644 @sascha-coenen Re: consistency, SQL currently always "finalizes" the aggregators, the specific finalization behavior comes from the underlying implementation of `AggregatorFactory.finalize()`. The HLL and Theta sketches `finalize()` implementations follow the core aggregators `HyperUniquesAggregatorFactory` and `ApproximateHistogramAggregatorFactory` in not returning the serialized sketch (the latter only received an option to finalize as base64 later on, false by default). Re: control/expressibility, I agree with you, and the issues with using the query context are noted, but I would need to think more about how that functionality would be best expressed/implemented. Maybe having certain "complex" aggs not be finalized by default in SQL, or an approach that you mentioned here: > This is a huge usability problem and I'm looking forward to writing a proposal for expressing such query hints within the SQL queries.
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