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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