Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19586
@ConeyLiu what about the below example, does your implementation support
this?
```scala
trait Base { val name: String }
case class A(name: String) extends Base
case class B(name: String) extends Base
sc.parallelize(Seq(A("a"), B("b"))).map { i => (i, 1) }.reduceByKey(_ +
_).collect()
```
Here not all the elements have same class type, does your PR here support
such scenario?
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