[GitHub] [incubator-pinot] ianvkoeppe opened a new pull request #4293: Add support for an aggregation function returning serialized hyperlog…

[GitBox <gi...@apache.org>]

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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