Rachelint commented on issue #11931:
URL: https://github.com/apache/datafusion/issues/11931#issuecomment-4072023708

   > This PR [#20964](https://github.com/apache/datafusion/pull/20964)
   > 
   > I think shows that we probably can do the block-based aggregation in a 
couple of smaller steps, something like:
   > 
   > * Change group accumulators to allocate fixed-size blocks
   > * Change group by values to allocate fixed-size blocks
   > * Integrate indices with new fixed-size block allocation
   
   Yes, I introduce the similar `Blocks<T>` in #15591 , but only used in 
accumulator, it should indeed also used in group values 


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