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Posted to github@arrow.apache.org by "comphead (via GitHub)" <gi...@apache.org> on 2023/02/17 18:48:45 UTC

[GitHub] [arrow-datafusion] comphead commented on issue #5313: Improve performance for DISTINCT queries

comphead commented on issue #5313:
URL: https://github.com/apache/arrow-datafusion/issues/5313#issuecomment-1435093379

   ![df-distinct-graph](https://user-images.githubusercontent.com/10247224/219758353-c5b40d5c-5a2b-4ff0-9e66-4b904e941b19.svg)
   Adding Flamegraph profiler for query 
   ```SELECT COUNT(*) AS c, COUNT(DISTINCT "UserID") FROM hits GROUP BY "RegionID" LIMIT 10;```
   


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