ianvkoeppe opened a new pull request #4293: Add support for an aggregation function returning serialized hyperlog… URL: https://github.com/apache/incubator-pinot/pull/4293 …logs. Client-side batching is a common requirement for reducing the query and response sizes to/from Pinot. In doing so, client's may then need to perform their own aggregation of results from the multiple responses returned. This is easy for sum, min, max, etc., but numerical values representing uniques cannot simply be added. Supporting the DISTINCTCOUNTRAWHLL and DISTINCTCOUNTRAWHLLMV will allow clients to receive the serialized HLL and then aggregate them client-side.
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