Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/1551#discussion_r15554364
--- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
---
@@ -344,7 +345,12 @@ private[spark] object PythonRDD extends Logging {
throw new SparkException("Unexpected Tuple2 element type " +
pair._1.getClass)
}
case other =>
- throw new SparkException("Unexpected element type " +
first.getClass)
+ if (other == null) {
+ dataOut.writeInt(SpecialLengths.NULL)
+ writeIteratorToStream(iter, dataOut)
--- End diff --
I was wrong; this _is_ tail-recursive. If we only expect nulls to occur in
iterators of strings, then I think we should be able to remove the null
checking here.
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