Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14588
Actually.. I took a look for this as well before. It seems `Annotation` in
Scala 2.10 does not have the `tree` function (see
https://github.com/scala/scala/blob/2.10.x/src/reflect/scala/reflect/api/Annotations.scala#L72-L85)
whereas Scala 2.11 does have
https://github.com/scala/scala/blob/2.11.x/src/reflect/scala/reflect/api/Annotations.scala#L71.
Just to make sure, I tested this in a clean VM as below:
```scala
scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._
scala> typeTag[String].tpe.typeSymbol.annotations.tree
<console>:14: error: value tree is not a member of
List[reflect.runtime.universe.Annotation]
typeTag[String].tpe.typeSymbol.annotations.tree
```
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