alamb commented on issue #6969:
URL: 
https://github.com/apache/arrow-datafusion/issues/6969#issuecomment-1640929894

   I am running some tests of the various approaches on
   
   * fixed width row format, inlined into hash table: 
https://github.com/yahoNanJing/arrow-datafusion/tree/EBAY-KYLIN-4003-5  from 
@yahoNanJing (aka with the change 
https://github.com/yahoNanJing/arrow-datafusion/commit/a18ac07420790d5c0010278e364cbef50b609230
 embeds the group value directly into the table)
   
   * unsafe row access https://github.com/apache/arrow-rs/pull/4539
   


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