Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/10366#issuecomment-165607657
I was able to verify SI-6654 locally and I think this is the correct fix:
```
scala> val map = Map[String, String]("a" -> "b", "c" -> "d")
map: scala.collection.immutable.Map[String,String] = Map(a -> b, c -> d)
scala> val filteredMap = map.filterKeys(_ != "a")
filteredMap: scala.collection.immutable.Map[String,String] = Map(c -> d)
scala> val identitiedMap = filteredMap.map(identity)
identitiedMap: scala.collection.immutable.Map[String,String] = Map(c -> d)
scala> (new ObjectOutputStream(new ByteArrayOutputStream)).writeObject(map)
scala> (new ObjectOutputStream(new
ByteArrayOutputStream)).writeObject(filteredMap)
java.io.NotSerializableException: scala.collection.immutable.MapLike$$anon$1
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
... 33 elided
scala> (new ObjectOutputStream(new
ByteArrayOutputStream)).writeObject(identitiedMap)
```
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