jonmmease opened a new pull request, #7616:
URL: https://github.com/apache/arrow-datafusion/pull/7616

   ## Which issue does this PR close?
   
   Closes #7473 
   
   ## Rationale for this change
   I'd like to be able to group by a List column
   
   ## What changes are included in this PR?
   Follows suggestion by @tustvold to hash List arrays by first hashing the 
inner values array and then using the list offsets to combine hashes within 
each list element.
   
   ## Are these changes tested?
   Yes, there is a unit test for the hash logic itself and an sqllogic test for 
the desired groupby behavior
   
   ## Are there any user-facing changes?
   GROUP BY on a list column will no longer error


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