Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1136#issuecomment-46644761
I found the issue and fixed it. Will push out a pull request soon.
If you can just add the boolean cast (always add it - no need to check if
the type is already boolean since once I fix the bug, the extra cast on boolean
value will be removed), that'd be great.
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