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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/13 10:24:05 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #298: Support window functions with empty `OVER` clause

alamb commented on issue #298:
URL: https://github.com/apache/arrow-datafusion/issues/298#issuecomment-840466714


   > I think a new operator might be the best to do here. They have very different semantics and needs.
   
   I agree that a new operator (along with a new kind of aggregate) is probably best here -- the way window aggregate functions are applied is different than "normal" aggregates -- among other things for a window function there is typically one row of output for each row of input whereas normal aggregates produce one row of output for each distinct value of grouping keys. 
   


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