Github user mccheah commented on the issue:
https://github.com/apache/spark/pull/21366
> @mccheah could you add a design doc for future reference and so that new
contributors can understand better the rationale behind this. There is some
description in the JIRA ticket but not enough to describe the final solution.
I can do that, but would we consider that blocking the merge of this PR?
I'd like to get this in soon, it's been open for awhile.
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