Github user chenghao-intel commented on the pull request:

    https://github.com/apache/spark/pull/3150#issuecomment-62115143
  
    It looks good to me in general, and I like the idea of summarizing the 
convertible data type checking, but in the meantime, I am a little afraid it 
might be error-prone for future maintenance or new data type added. 
    Or can we remove the `resolve` method?


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