Github user daniel-shields commented on the issue:
https://github.com/apache/spark/pull/21449
I'm not sure that this behavior should be applied to all binary
comparisons. It could result in unexpected behavior in some rare cases. For
example:
`df1.join(df2, df2['x'] < df1['x'])`
If 'x' is ambiguous, this would result in the conditional being flipped.
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