Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6222#issuecomment-105693078
Ah, this failure is due to a change thatI made to UserDefinedGenerator.
It's now creating a single row converter and re-using it across calls to
`eval(row)`, but this had the side-effect of causing it's child's attribute to
be accessed before it has been resolved. I've pushed a fix.
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