Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/2543#issuecomment-58600998
@marmbrus As commented before, I think we should handle `GetItem` and
`GetField` differently even they are very similar. For `GetItem`, we need
calculate the `ordinal` by evaluating an expression, for `GetField`, we can
calculate the `ordinal` by searching the corrected `StrcutField` according to
`fieldName` which I think should be done in analyze phase. It may be better to
put `StructFiled` into `GetFiled` but not a simple `fieldName`.
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