Github user srowen commented on the pull request: https://github.com/apache/spark/pull/10023#issuecomment-161978114 @mengxr is that really an assumption that the code makes? the underlying partitions in, say, HDFS can certainly have more and @uncleGen 's reproduction seems legitimate. We could make a better error and forbid it though it seems maybe OK to support it anyway in this method?
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