Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5798#issuecomment-97637937
This is a workaround for the fixing, however, in long term, we should
refactor the `Resolver`, to support the attribute name normalization (either
to upper case or lower case), otherwise, we will always runs into the bug when
checking the expression existence in a expression set.
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