[GitHub] pzhdfy opened a new issue #6716: [Proposal] exactly count distinct support in Druid

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pzhdfy opened a new issue #6716: [Proposal] exactly count distinct support in Druid
URL: https://github.com/apache/incubator-druid/issues/6716
 
 
   **Motivation**
   In many case, we need exactly count distinct, like charging.
   But now, druid can not do well.
   
   **Design**
   Because exactly count distinct is not very needed in realtime  ,We first will design to implement in offline Ingestion.
   The design is divided into two parts. One is the how to convert dim value to a global uniq ID, so roll up can be done by different segments.We need a global dict to do this
    and the other is how to store uniq ids in druid with least storage, so we need bitmap.
   

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