Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/12627#issuecomment-220102877
Thank you for everyone who involved in this work. I agree that the amount
of work was underestimated, and some of them were actually hard to estimate
given the issues were popped up durning the implementation. However, we should
work on this kind of major changes in the beginning of release to ensure that
we have enough time to address unexpected issues. Thanks again!
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