rdettai edited a comment on issue #962:
URL: 
https://github.com/apache/arrow-datafusion/issues/962#issuecomment-909268730


   As suggested by @Dandandan, we might also want to consider the fact that the 
statistics can be updated at runtime (like Spark AQE). In Ballista, an 
execution plan for a stage that takes a shuffle as input might be re-optimized 
according to the statistics of the shuffle boundary. For instance, this might 
change the optimal build/probe order of the tables for a join that has the 
shuffle boundary as one of its inputs.


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