[jira] [Created] (FLINK-2105) Implement Sort-Merge Outer Join algorithm

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-2105:
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             Summary: Implement Sort-Merge Outer Join algorithm
                 Key: FLINK-2105
                 URL: https://issues.apache.org/jira/browse/FLINK-2105
             Project: Flink
          Issue Type: Sub-task
          Components: Local Runtime
            Reporter: Fabian Hueske
            Priority: Minor


Flink does not natively support outer joins at the moment.
This issue proposes to implement a sort-merge outer join algorithm that can cover left, right, and full outer joins.

The implementation can be based on the regular sort-merge join iterator ({{ReusingMergeMatchIterator}} and {{NonReusingMergeMatchIterator}}, see also {{MatchDriver}} class)

The Reusing and NonReusing variants differ in whether object instances are reused or new objects are created. I would start with the NonReusing variant which is safer from a user's point of view and should also be easier to implement.



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