haohuaijin opened a new issue, #22775:
URL: https://github.com/apache/datafusion/issues/22775

   I am also a bit confused for this API, what's the semantics for 
`opt_filter`? In `update_filter` it's quite obvious, they refer to the filter 
in the original query like `avg(x) filter x>0`, here can we assume they're 
always `None`, and for groups with `Null` state, it should be encoded in the 
`values` null mask?
   
   I can't find the doc on trait, it seem to depend on implementation now. I 
suggest we can figure it out the existing practice and update the doc. (in 
follow up PR for sure)
   
   _Originally posted by @2010YOUY01 in 
https://github.com/apache/datafusion/pull/22768#discussion_r3361258179_
               


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