Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/8707#issuecomment-139612356 Over at https://issues.apache.org/jira/browse/SPARK-10544, someone commented to mention that other types of built-in types do not seem to be pickleable in 1.5. For instance, here's the example that they gave: ```python sc.parallelize(["the red", "Fox Runs", "FAST"]).map(str.lower).count() ``` However, this specific example also seems to fail in 1.3.1, so I don't think that this is a regression. Just wanted to mention this discussion here to make sure you were aware of it.
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