Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/10205#issuecomment-189440632
> an optional function that could be used to validate the config value
I see. That's doable, although it probably would be good to have some
"common" validators (such as "must be a positive number", which is probably the
most common). That probably ties into the discussion about how to handle types
- let me see if I can come up with a not-so-horrible way of doing it.
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