Github user sadhen commented on the issue:
https://github.com/apache/spark/pull/22264
@srowen Still work in progress.
There are three unit test failures in total.
The first one is fixed.
And this is the cause of the second one:
```
Welcome to Scala 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java
1.8.0_112).
Type in expressions for evaluation. Or try :help.
scala> import collection.mutable.WrappedArray
import collection.mutable.WrappedArray
scala> new WrappedArray.ofRef(Array(1, 1).map(_.asInstanceOf[AnyRef]))
res0: scala.collection.mutable.WrappedArray.ofRef[AnyRef] = WrappedArray(1,
1)
scala> new WrappedArray.ofRef(Array(1.0, 1.0).map(_.asInstanceOf[AnyRef]))
res1: scala.collection.mutable.WrappedArray.ofRef[AnyRef] =
WrappedArray(1.0, 1.0)
scala> res0 == res1
res2: Boolean = true
```
```
scala2.12â¨â¨scala> new WrappedArray.ofRef(Array(1,
1).map(_.asInstanceOf[AnyRef]))
res18: scala.collection.mutable.WrappedArray.ofRef[AnyRef] =
WrappedArray(1, 1)
scala> new WrappedArray.ofRef(Array(1.0, 1.0).map(_.asInstanceOf[AnyRef]))
res19: scala.collection.mutable.WrappedArray.ofRef[AnyRef] =
WrappedArray(1.0, 1.0)
scala> res18.getClass
res20: Class[_ <: scala.collection.mutable.WrappedArray.ofRef[AnyRef]] =
class scala.collection.mutable.WrappedArray$ofRef
scala> res19.getClass
res21: Class[_ <: scala.collection.mutable.WrappedArray.ofRef[AnyRef]] =
class scala.collection.mutable.WrappedArray$ofRef
scala> res18 == res19
res22: Boolean = false
```
A behavior change introduced by https://github.com/scala/scala/pull/5551 .
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