houqp commented on issue #112:
URL: 
https://github.com/apache/arrow-datafusion/issues/112#issuecomment-945373608


   My bad, should `CoalesceBatchesExec` was the wrong one, it coalesces by 
batch size, not partition count. `CoalescePartitionsExec` is the correct one. 
However, currently it is restricted to only produce one partition, so there is 
more work than just connecting it to a logical plan node :( Will need to make 
that partition count configurable first.


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