[jira] [Created] (FLINK-3412) Remove implicit conversions JavaStream / ScalaStream

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-3412:
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             Summary: Remove implicit conversions JavaStream / ScalaStream
                 Key: FLINK-3412
                 URL: https://issues.apache.org/jira/browse/FLINK-3412
             Project: Flink
          Issue Type: Bug
          Components: Scala API
    Affects Versions: 0.10.2
            Reporter: Stephan Ewen
             Fix For: 1.0.0


I think the implicit conversions between the Java DataStream and the Scala DataStream are dangerous.

Because conversions exist in both directions, it is possible to write methods that look like calling functions on the JavaStream, but instead convert it to a Scala stream and call a different method.
I just accidentally implemented an infinite recursion that way (via two hidden implicit conversions).

Making the conversions explicit (with a {{wrap()}} function like in the batch API, we add minimally more code internally (nothing is different for users), but avoid such accidental errors.



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