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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2020/06/19 13:58:25 UTC

[GitHub] [calcite] rubenada commented on pull request #2037: [CALCITE-3834] Support AntiJoin in EnumerableMergeJoin

rubenada commented on pull request #2037:
URL: https://github.com/apache/calcite/pull/2037#issuecomment-646651556


   @hsyuan the behavior of our JoinType ANTI is not like a NOT IN, but a NOT EXISTS.
   Some time ago, I added a test case for this precise scenario in EnumerableCorrelateTest#antiJoinCorrelateWithNullValues (there is a comment in there explaining the situation).
   Bear in mind that, at that time, ANTI was a CorrelateJoinType, but not a JoinType. Later, with the big Join refactoring, ANTI (together with SEMI) was added as JoinType, and CorrelateJoinType was deprecated (and later removed). So, we must see ANTI as a NOT EXISTS, whose null management is not as drastic as NOT IN.


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