milenkovicm commented on code in PR #1649:
URL: 
https://github.com/apache/datafusion-ballista/pull/1649#discussion_r3212633994


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ballista/scheduler/src/state/aqe/optimizer_rule/propagate_empty.rs:
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Review Comment:
   I think we do, in this case, the later one will transform exchange into 
empty this one will eliminate exchange if there is empty input 



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