Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/8503#issuecomment-135905963
@felixcheung for the column being replaced part, I'd say we can open
another jira / discuss it for later. I prefer the existing behavior of
appending columns and users can drop columns (either with a select or by
setting it to `NULL` in SparkR)
cc @falaki
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