Github user gyfora commented on the pull request:
https://github.com/apache/incubator-flink/pull/275#issuecomment-67821435
The Java api FieldsKeySelector works on array, java tuple and pojo types as
well, but it doesnt work on scala tuples.
The Scala FieldsKeySelector works on Java and Scala tuples, and the
CaseClassKeySelector works on case classes.
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