Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/2209#issuecomment-53975089
I actually encountered the error with a jsonRDD, but yeah it could happen
with parquet files as well. Your comment about joins though makes me think
that we should just get rid of this check entirely. We can throw an error when
your query is invalid, but throwing an exception just because at some point in
a query something _could_ be ambiguous seems overly restrictive.
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