[jira] [Resolved] (FLINK-875) Optimizer introduces Unnecessary Sort in Iterations

Posted by Shang Yuanchun (Jira) on Jun 17, 2014; 12:13am
URL: http://deprecated-apache-flink-mailing-list-archive.368.s1.nabble.com/jira-Resolved-FLINK-875-Optimizer-introduces-Unnecessary-Sort-in-Iterations-tp310.html


     [ https://issues.apache.org/jira/browse/FLINK-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen resolved FLINK-875.
--------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: pre-apache)
                   0.6-incubating
         Assignee: Stephan Ewen

Fixed alongside [FLINK-935] in commit ca2b287a7a78328ebf43766b9fdf39b56fb5fd4f

> Optimizer introduces Unnecessary Sort in Iterations
> ---------------------------------------------------
>
>                 Key: FLINK-875
>                 URL: https://issues.apache.org/jira/browse/FLINK-875
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: GitHub Import
>            Assignee: Stephan Ewen
>              Labels: github-import
>             Fix For: 0.6-incubating
>
>
> There is a Bug in the Optimizer that introduces an unnecessary sort. You ran reproduce the Bug by taking the "PageRankBasic" example program and adding an `@ConstantFields("0")` annotation to the `Dampener` MapFunction.
> The produced plan is shown below. The sort is unnecessary since the join algorithm is a hash join.
> ![opt_bug_screenshot|https://cloud.githubusercontent.com/assets/1727146/3092106/8f003ade-e5a5-11e3-8d5e-2c96beef3bb9.png]
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/875
> Created by: [StephanEwen|https://github.com/StephanEwen]
> Labels: enhancement, optimizer,
> Created at: Tue May 27 15:48:48 CEST 2014
> State: open

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