[jira] [Closed] (FLINK-879) Allow empty result in cross function call

["Robert Metzger (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Metzger closed FLINK-879.
--------------------------------
    Resolution: Won't Fix

> Allow empty result in cross function call
> -----------------------------------------
>
>                 Key: FLINK-879
>                 URL: https://issues.apache.org/jira/browse/FLINK-879
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / DataSet
>            Reporter: GitHub Import
>            Priority: Minor
>              Labels: github-import
>
> It is somehow annoying that the CrossFunction Class enforces a result in cross.
> For example, if you have a set with data points and want to compute the distances, you  properly don't want to compute the distance between the same point.
> The only workaround is a points.cross(points).with(...).filter(...) chain. The additional filter step produce much unnecessary java code.
> Simple fix:
> Remove the final flag from cross(in1, in2, out) in eu.stratosphere.api.java.functions.CrossFunction and override this instead of cross(in1, in2).
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/879
> Created by: [derSascha|https://github.com/derSascha]
> Labels: enhancement, java api, user satisfaction, 
> Created at: Tue May 27 23:29:24 CEST 2014
> State: open



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