adriangb opened a new issue, #19972:
URL: https://github.com/apache/datafusion/issues/19972

   consider `select count(*) from t where id > 5`. I think we still build a 
mask, etc. internally but in the case we have no output projection we could 
maybe track just the number of matching rows as an integer? maybe there's 
already something in place, just jotting down thoughts.


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