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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