Github user jacques-n commented on the pull request:
https://github.com/apache/drill/pull/257#issuecomment-156919949
I think it is fine if you handle the unsupported map behaviors with a clear
user exception. Other than the refactoring of getFieldId (if possible), LGTM.
+1. (Assuming that this functionality only changes system behavior in the case
that Union vector is enabled.)
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