Github user chutium commented on the pull request:
https://github.com/apache/spark/pull/10044#issuecomment-160913033
it was caused by this commit about half years ago:
https://github.com/apache/spark/commit/3bee0f1466ddd69f26e95297b5e0d2398b6c6268#diff-29dffdccd5a7f4c8b496c293e87c8668L771
hope no other small hidden bugs there... maybe worth a double check again
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