Fabian Hueske created FLINK-2107:
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Summary: Implement Hash Outer Join algorithm
Key: FLINK-2107
URL: https://issues.apache.org/jira/browse/FLINK-2107
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 hash outer join algorithm that can cover
left and right outer joins.
The implementation can be based on the regular hash join iterators (for example
`ReusingBuildFirstHashMatchIterator` and
`NonReusingBuildFirstHashMatchIterator`, 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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