Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7418#issuecomment-122191060
@viirya, I mean you at least have a single group (less than 50 fields), it
probably cause performance issues for case like:
`select a+b from src`, as the overhead of function invoke is heavy compare
to the `a+b` itself.
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