Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/6361#issuecomment-109171615 Trying to dig into the stracktrace a bit:, here an excerpt from GenericUDTFExplode.java in hive-exec-0.13.1a-sources.jar: ```java private transient final Object[] forwardListObj = new Object[1]; private transient final Object[] forwardMapObj = new Object[2]; @Override public void process(Object[] o) throws HiveException { switch (inputOI.getCategory()) { case LIST: ListObjectInspector listOI = (ListObjectInspector)inputOI; List<?> list = listOI.getList(o[0]); if (list == null) { return; } for (Object r : list) { forwardListObj[0] = r; // <------- line 93 that throws NPE forward(forwardListObj); } break; ``` Based on the line number, I think that the NPE is being thrown because the transient field `forwardListObj` is null`. Since this field is `transient final` I wonder if this class wasn't designed to have its `process` method called on deserialized instances. If that's the case, though, I'm puzzled at why we wouldn't see similar behavior with Java serialization. The problem must be a bit deeper and merits more investigation.
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