Github user xiliu82 commented on the pull request:
https://github.com/apache/spark/pull/796#issuecomment-43568364
I have a test but it has too much application information, so I will try to
write a minimum test. Unfortunately named_struct also failed to work because it
is expecting WritableConstantStringObjectInspector, and catalyst returned
JavaStringObjectInspector, I am not sure I want to change that yet.
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