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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-687) Add support for outer-joins
Date Thu, 28 May 2015 11:48:17 GMT

    [ 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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