[GitHub] [pinot] Jackie-Jiang commented on issue #8225: Multiple argument support for DISTINCTCOUNTHLL/DISTINCTCOUNTTHETASKETCH

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

Jackie-Jiang commented on issue #8225:
URL: https://github.com/apache/pinot/issues/8225#issuecomment-1045099301


   One work-around is to concat the two columns into a single string, e.g. `select distinctcounthll(concat(id, date, ',')) from myTable`. The performance could be sub-optimal because the dictionary/type-based optimization cannot be applied.
   
   To optimize the performance, one solution is to combine multiple values from different columns into a `byte[]` then feed into the hll/thetasketch. This should give better performance than representing numbers using strings


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