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https://issues.apache.org/jira/browse/FLINK-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908141#comment-14908141
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ASF GitHub Bot commented on FLINK-2576:
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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.
> Add outer joins to API and Optimizer
> ------------------------------------
>
> Key: FLINK-2576
> URL: https://issues.apache.org/jira/browse/FLINK-2576
> Project: Flink
> Issue Type: Sub-task
> Components: Java API, Optimizer, Scala API
> Reporter: Ricky Pogalz
> Priority: Minor
> Fix For: pre-apache
>
>
> Add left/right/full outer join methods to the DataSet APIs (Java, Scala) and
> to the optimizer of Flink.
> Initially, the execution strategy should be a sort-merge outer join
> (FLINK-2105) but can later be extended to hash joins for left/right outer
> joins.
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