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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2576] Add Outer Join operator to Optimi...
Date Wed, 23 Sep 2015 22:52:19 GMT
Github user StephanEwen commented on the pull request:

    https://github.com/apache/flink/pull/1138#issuecomment-142754122
  
    Agreed with Fabian. For now, let's require join functions.
    
    Future work would be to use Tuples with Options in Scala. In Java, we should probably
add an option type as well (and teach the TypeExtractor to use them). Java core adds an Option
type only in Java 8, unfortunately.
    
    We could add one for Java 7 and deprecate it later.


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