Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1138#issuecomment-143250678
We have a couple of unit tests to check the correctness of the API, i.e.,
check that valid use is working and invalid use throws an early exceptions. See
for example `org.apache.flink.api.java.operator.JoinOperatorTest`. It would be
good to have such unit tests as well for outer joins.
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