[FLINK-1378] [scala] Fix type extraction for nested type parameters
Before, something like: def f[T: TypeInformation](data: DataSet[T]) = { val tpe = createTypeInformation[(T, Seq[T])] println("Type: " + tpe) } f(Seq(1.0f, 2.0f) would fail because the type extractor could not re-use existing TypeInformation for nested types.
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