novatechflow opened a new pull request, #647:
URL: https://github.com/apache/incubator-wayang/pull/647

   this should fix the non-deterministic enumeration. Main issue from my point 
of view was that we relied completely on plain `HashSet` all over the place => 
the order changed every time the JVM ran, therefore a unpredictable hash-set 
ordering was the root cause.
   
   Wrote a regression test, too:
   `mvn -pl wayang-commons/wayang-core 
-Dtest=PlanEnumerationDeterminismTest,ChannelConversionGraphDeterminismTest 
test`


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