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https://issues.apache.org/jira/browse/FLINK-687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14562728#comment-14562728
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Fabian Hueske commented on FLINK-687:
-------------------------------------
[~till.rohrmann] +1 For starting with a Sort-Merge Join strategy. It can cover
left, right, and full outer joins and should be easy to implement. Hash
variants for left and right outer joins can be easily added later.
I'll open sub-issues for a Sort-Merge Outer Join algorithms and integrating it
into API, optimizer, and runtime.
> Add support for outer-joins
> ---------------------------
>
> Key: FLINK-687
> URL: https://issues.apache.org/jira/browse/FLINK-687
> Project: Flink
> Issue Type: New Feature
> Reporter: GitHub Import
> Assignee: Chiwan Park
> Priority: Minor
> Labels: github-import
> Fix For: pre-apache
>
>
> There are three types of outer-joins:
> - left outer,
> - right outer, and
> - full outer
> joins.
> An outer-join does not "filter" tuples of the outer-side that do not find a
> matching tuple on the other side. Instead, it is joined with a NULL value.
> Supporting outer-joins requires some modifications in the join execution
> strategies.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/687
> Created by: [fhueske|https://github.com/fhueske]
> Labels: enhancement, java api, runtime,
> Created at: Mon Apr 14 12:09:00 CEST 2014
> State: open
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