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Fabian Hueske commented on FLINK-2105: -------------------------------------- [~chiwanpark] is right. This issue is about the implementation of an {{OuterJoinMergeIterator}} with a very good test coverage. The integration with Drivers and Operators is part of FLINK-687. > 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 > Assignee: Ricky Pogalz > Priority: Minor > Fix For: pre-apache > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)