Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/8684#issuecomment-149770204
@mengxr as you suggested, it would be great not to contain doc changes in
this PR. However, `@since` tag needs any comment. Otherwise, it doesn't work.
Should we add `@since` tag, after adding comments to methods which don't have
any comments?
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