comphead commented on issue #5969:
URL: 
https://github.com/apache/arrow-datafusion/issues/5969#issuecomment-1507912263

   reg to flamegraph the 
`datafusion::physical_plan::aggregates::row_hash::slice_and_maybe_filter` is 
expensive.
   its expensive because excessive vector allocations. I will try to rewrite 
this method tomorrow and share results


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