Crystrix commented on pull request #12369:
URL: https://github.com/apache/arrow/pull/12369#issuecomment-1041838142


   > So basically, this is equivalent to selecting all unique tuples of the 
input keys? 
   
   Yes, the result is the same.
   
   > and this has the added benefit of being incrementally computed
   
   That's right, and then such SQL query can be supported 
   `SELECT foo FROM table GROUP BY foo
   `
   
   


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