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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (FLINK-1664) Forbid sorting on POJOs
Date Fri, 03 Apr 2015 19:35:52 GMT

     [ https://issues.apache.org/jira/browse/FLINK-1664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Fabian Hueske resolved FLINK-1664.
       Resolution: Fixed
    Fix Version/s: 0.9

Fixed with f36eb54ee6d8cc130439def98559b6b0a70b6c7b

> Forbid sorting on POJOs
> -----------------------
>                 Key: FLINK-1664
>                 URL: https://issues.apache.org/jira/browse/FLINK-1664
>             Project: Flink
>          Issue Type: Bug
>          Components: JobManager
>    Affects Versions: 0.8.0, 0.9
>            Reporter: Fabian Hueske
>            Assignee: Fabian Hueske
>             Fix For: 0.9
> Flink's groupSort, partitionSort, and outputSort operators allow to sort partitions or
groups of a DataSet.
> If the sort is defined on a POJO field, the sort order is not well defined. Internally,
the POJO is recursively decomposed into atomic fields (primitives or generic types) and sorted
by sorting these atomic fields. Thereby, the order of these atomic fields is not well defined
(I believe it is lexicographic order of the POJO's member names).
> IMO, the best approach is to forbid sorting on POJO types for now. Instead, it is always
possible to select the nested fields of the POJO that should be used for sorting. Later we
can relax this restriction.

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