findepi commented on issue #11303:
URL: https://github.com/apache/datafusion/issues/11303#issuecomment-2211795107

   Related to this, we could maybe support zero-arg `count()`.
   
   For 2+ args for count, I as a user would prefer to used filtered 
aggregation. It's then obvious whether I am counting rows when all args are not 
null, or when at least one is not null:
   
   ```
   count() FILTER (WHERE a IS NOT NULL ( AND | OR ) b IS NOT NULL)
   ```
   
   (definitely more verbose than `count(a, b)`, but is `count(a, b)` 
established & consistent across query engines?)
   
   


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