Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21449
Sure, thanks for your time.
PS `df.join(df, df("id") >= df("id"))` may be ambiguous, but in the example
above
`df1.join(df2, df2['id'].eqNullSafe(df1['id'])).collect()` where `df1` and
`df2` are created from the same dataframe it is not ambiguous IMHO.
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