Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14580
`canFilterOutNull ` will cover almost all the cases. Sorry, I did not read
the plan until you asked me to write a test case. Then, I realized the
implementation of natural/using join is just using `coalesce`. As @hvanhovell
and @nsyca said, that is just a syntactic sugar.
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