cuixiaozong commented on PR #43663:
URL: https://github.com/apache/spark/pull/43663#issuecomment-1794860123

   For this part
   MODE() WITHIN GROUP (ORDER BY sortSpecification)
   [FILTER (WHERE expression)] [OVER windowNameOrSpecification]
   
   We can write order by in windowNameOrSpecification, why do we need ORDER BY 
sortSpecification after WITHIN GROUP ?


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