hbtoo commented on pull request #2187:
URL: https://github.com/apache/calcite/pull/2187#issuecomment-704573437


   > @hbtoo Thanks for your pull request. It seems like there are some test 
failures for Druid tests. Can you take a look? I believe most of them are plan 
diffs that are caused by the BFS strategy change.
   
   I did an investigation and found out that the old and new best plan has 
exactly the same cost. The best switched because of the change in update order 
in this PR. So this is expected, so I the expected result of the tests. 


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