Github user chenghao-intel commented on the pull request:

    https://github.com/apache/spark/pull/7418#issuecomment-122137477
  
    My concern on this fix is, that probably cause performance issue, if we add 
a function call for each of the projection field, as codegen aim to inline the 
logic into a single function.
    Can you give a benchmark result for this fixing? 


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