Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/2761#issuecomment-58759963 It would be neat if there was some way to restrict the style checker to only check new/changed lines introduced by a PR. This could be hard to integrate with local development workflows, though: I might be developing some code locally and periodically running scalastyle before opening a pull request, so we'd need to make sure that we don't emit tons of warnings from existing code. Maybe one approach would be to find all of the style warnings, then check whether the commits that introduced the lines that triggered the warnings are present in either `origin/master` or `origin/branch-1-1`.
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