Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/15697
  
    For the specific failure here, it was due to not syncing the latest version 
between the releases for Winodws and the others (when R 3.3.2 was released). As 
we use a fixed version, R 3.3.1 now (not the latest but old one), we wouldn't 
meet the same case for the same reason in the future (I described this problem 
in more details in https://github.com/apache/spark/pull/15709). 
    
    However, I guess you meant the concern of re-triggering the spurious 
failures in general. For re-triggering tests, I am still looking into this 
deeper. Will make a INFRA JIRA as soon as I figure out the way committers can 
re-trigger. Current ways I have figured out so far as a (ugly) workaround are, 
    - Use another AppVeyor account
    - Closing and then re-opening to launch another build.
    



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