[jira] [Created] (FLINK-2556) Fix/Refactor pre-flight Key validation

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-2556:
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             Summary: Fix/Refactor pre-flight Key validation
                 Key: FLINK-2556
                 URL: https://issues.apache.org/jira/browse/FLINK-2556
             Project: Flink
          Issue Type: Bug
          Components: Java API
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler


The pre-flight key validation checks are inconsistent, at times don't actually check anything and in at least 1 case are done redundantly.

For example,
* you can group on a tuple containing a non-Atomic-/CompositeType using String[] KeyExpressions (see FLINK-2541)
* you can group on an AtomicType even though isKeyType() returns false, if it is contained in a tuple
* for distinct(String[]...) the above fails in the DistinctOperator constructor, as it validates the key again for some reason.



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