Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/11632#issuecomment-200425131
It seems that user intentions in the example query is obvious to some
extent, so I wonder if we can automatically fix this kind of name ambiguity in
an `Analyzer` phase?
Throwing an exception to make users eliminate ambiguity is one of solutions
though,
we slightly loss the simplicity of user codes.
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