Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/354#issuecomment-72741911
I looked into your issue. Scala has a very strange behavior at this point.
I don't know why it converts `Int` to `Object`. The TypeExtractor gets
`Tuple3<Object, Object, String>` which results in an input mismatch exception
which is correct. If you take `Integer` instead of `Int` everything works fine.
@aljoscha do you have an idea?
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