jorisvandenbossche commented on issue #44961:
URL: https://github.com/apache/arrow/issues/44961#issuecomment-2535031414

   > Could you clarify why this filtering expression cannot be used? It appears 
to be a scalar expression,
   
   Counting values in a column is not actually a "scalar" expression (at least 
in the way we use that term, i.e. as an element-wise function that can be 
calculated for each element in the array independently. Counting is a kind of 
reduction, and that requires to consider the full array to get the result)
   


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