Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/10762#issuecomment-176532100
Acutally MySQL and Oracle does not support normal full outer join either.
PostgreSQL does support natural full outer join:
http://www.postgresql.org/docs/9.1/static/queries-table-expressions.html
I think we should support natural full outer join since we support full
outer join.
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