Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/15686 There are three problems with it. - it starts the build when someone merges the latest upstream (not rebases) when pushing more commits in its PR (as the merged one usually has the changes in R) - this case seems fine though because usually it suceeds to build. Also actually I asked this case to AppVeyor but I haven't received the reply. - it sometimes failes to build (it is relatively rare I believe). - it leaves a failure mark on other branches when someone opens a PR from a branch to another branch. I am neutral because it seems the cases are not often. I may open a JIRA if I incline toward disabling this or please feel free to create a JIRA if anyone feels so. (Let me please cc @shivaram. I would like him to know about this).
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