Github user gatorsmile commented on the pull request: https://github.com/apache/spark/pull/9385#issuecomment-152708351 So far, I just observed this strange ghosting values when I read the optimized logical tree, but my query did not trigger any issue. Based on my understanding, usage of qualifiers is still limited in the current code base. It could be a potential issue when we support more complex SQL syntax/functions. Thus, I submitted this pull request to resolve this issue.
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