Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1981#issuecomment-221899756
Hi @dawidwys, the equi join check is a bit more involved. I implemented a
CNF converter based on the algorithm described here:
http://cs.jhu.edu/~jason/tutorials/convert-to-CNF (see my
[branch](https://github.com/fhueske/flink/tree/tableOuter) ).
You can try to do implement the algorithm as well. Alternatively, we can
also use my version.
Another thing we need to fix is the documentation, i.e., extending the
Table API description and removing the outer join restriction in the SQL
section in `docs/apis/table.md`.
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