Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1099#issuecomment-138329755
I think the way to go is not to put the type info into the class, but into
the methods, and create it as follows:
```scala
def zipWithIndex[T : TypeInformation : ClassTag](): DataSet[(Long, T)] = {
val tInfo = implicitly[TypeInformation[T]]
implicit val tupleTypeInformation = new CaseClassTypeInfo[(Long, T)](
classOf[(Long, T)],
Array(BasicTypeInfo.LONG_TYPE_INFO, tInfo),
Seq(BasicTypeInfo.LONG_TYPE_INFO, tInfo),
Array("_1", "_2"))
wrap(jutils.zipWithIndex(self.javaSet)).map { t => (t.f0.toLong, t.f1) }
```
All the methods in the utils class should have parenthesis, they are not a
side effect free getters after all.
Also, some tooling around creating Scala Tuple type information would be
nice. I can see that there are more places where one would do that.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
