Github user yhuai commented on the pull request:

    https://github.com/apache/spark/pull/4607#issuecomment-74405239
  
    @yanbohappy Thank you for working on it! For SPARK-5746, I think it is 
better to add an analysis rule to do a check and throw an exception when you 
find that users try to write to a table while reading it. Actually, I have been 
working on it and will have a PR soon. How about we use this PR to address the 
issue of SPARK-5821 in JSONRelation? Can you also try the parquet data source 
and see if SPARK-5821 also affects that? 


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