tanelk commented on pull request #32057:
URL: https://github.com/apache/spark/pull/32057#issuecomment-814335217


   Perhaps @cloud-fan can comment on this. Why does `ObjectHashAggregateExec` 
require at least on of its aggregate functions to be `TypedImperativeAggregate`?
   
   
https://github.com/apache/spark/blob/4b5fc1da752ec008468ef80a5717c8beab468387/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/ObjectHashAggregateExec.scala#L143-L149
   
   Without that check the decision tree would be much simpler:
   1) Are all agg buffers fixed with? Use `HashAggregateExec`
   2) Is `conf.useObjectHashAggregation` enabled? Use `ObjectHashAggregateExec`
   3) Use `SortAggregateExec`


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