[jira] [Created] (FLINK-1963) Improve distinct() transformation

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-1963:
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             Summary: Improve distinct() transformation
                 Key: FLINK-1963
                 URL: https://issues.apache.org/jira/browse/FLINK-1963
             Project: Flink
          Issue Type: Improvement
          Components: Java API, Scala API
    Affects Versions: 0.9
            Reporter: Fabian Hueske
            Priority: Minor
             Fix For: 0.9


The `distinct()` transformation is a bit limited right now with respect to processing atomic key types:

- `distinct(String ...)` works only for composite data types (POJO, tuple), but wildcard expression should also be supported for atomic key types
- `distinct()` only works for composite types, but should also work for atomic key types
- `distinct(KeySelector)` is the most generic one, but not very handy to use
- `distinct(int ...)` works only for Tuple data types (which is fine)



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