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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2020/06/05 22:00:45 UTC

[GitHub] [calcite] amaliujia edited a comment on pull request #1995: [CALCITE-4012] Implement trait propagation for EnumerableHashJoin and…

amaliujia edited a comment on pull request #1995:
URL: https://github.com/apache/calcite/pull/1995#issuecomment-639849246


   @hsyuan any suggestions on how hash join (maybe also nested loop join) traits derivation should be tested?
   
   I am thinking doing this
   ```
   select * from
   (select distinct a, b from foo) foo
   join bar on foo.c = bar.c 
   ```
   
   Then the produced plan might add a Sort on top of Select.
   
   Do you think it is right?
   


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