comphead commented on PR #9991:
URL: 
https://github.com/apache/arrow-datafusion/pull/9991#issuecomment-2048157755

   > Thanks @huaxingao -- I agree this does what the ticket requests; However 
given what you have found about `SUM(ORDER BY ...)` it may make sense to permit 
that case 🤔
   
   this query is invalid, our parser allows it but it should fail. IGNORE NULLS 
have a limited functions to be worked with.  all other query engine parsers 
does. 


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