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[ML][PYTHON][SPARK-12834][BACKPORT] Change ser/de of JavaArray and JavaList #10941

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[ML][PYTHON][SPARK-12834][BACKPORT] Change ser/de of JavaArray and JavaList #10941

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6 changes: 5 additions & 1 deletion mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1464,7 +1464,11 @@ private[spark] object SerDe extends Serializable {
initialize()

def dumps(obj: AnyRef): Array[Byte] = {
new Pickler().dumps(obj)
obj match {
// Pickler in Python side cannot deserialize Scala Array normally. See SPARK-12834.
case array: Array[_] => new Pickler().dumps(array.toSeq.asJava)
case _ => new Pickler().dumps(obj)
}
}

def loads(bytes: Array[Byte]): AnyRef = {
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