jayshrivastava commented on issue #18856:
URL: https://github.com/apache/datafusion/issues/18856#issuecomment-5386930438

   I implemented the propagators / anchors here: 
https://github.com/datafusion-contrib/datafusion-distributed/pull/634
   
   > ```
   > stage3:
   >    HashJoinExec <- producer of filter1
   >        NetworkShuffleExec  (anchors: filter1, filter2)
   >
   >stage2:
   >    RepartitionExec
   >        AggregateExec <- producer of filter2
   >            NetworkShuffleExec   (anchors: filter1, filter2)
   >
   >stage1:
   >        DataSourceExec (consumer: filter1, filter2)
   >```
   
   A fair bit of code dedicated to working around the fact that the hash join 
decides during execution if it should produce filters or not.


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