Github user aalexandrov commented on the pull request:
https://github.com/apache/flink/pull/354#issuecomment-72660318
I would advocate to adding this one as well as a fallback option.
I have a situation where I want to use KeySelector that might return Java
TupleXX instances parameterized with Scala types, e.g.:
```
class SelectFoo extends KeySelector[Tuple3[Int, Int, String], Tuple3[Int,
String]] {
override def getKey(v: Tuple3[Int, Int, Int]) = new Tuple2(v.f0, v.f2)
}
``
Even though in this cases the generic parameters are available, the Scala
types cannot be inferred because the actual type field type parameters are
erased by Scala and are seen only as java.lang.Object from the Java reflection
API.
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