Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9760#issuecomment-157342723
This changes LGTM, but I don't quite understand this line in the PR
description:
> ... This PR introduce a hard limit as 4M for total columns (up to 50
columns of uncompressed primitive columns).
Where is the "50" from? Is it a hard limit defined somewhere else or an
estimation of average use case?
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