[jira] [Updated] (FLINK-1599) TypeComperator with no keys and comparators matches some elements

["Max Michels (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-1599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Max Michels updated FLINK-1599:
-------------------------------
    Summary: TypeComperator with no keys and comparators matches some elements  (was: TypeComperator)

> TypeComperator with no keys and comparators matches some elements
> -----------------------------------------------------------------
>
>                 Key: FLINK-1599
>                 URL: https://issues.apache.org/jira/browse/FLINK-1599
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Runtime
>    Affects Versions: 0.8.0
>            Reporter: Max Michels
>            Priority: Minor
>
> If you create a custom type comparator by subclassing {{TypeComperator}} and implement {{int extractKeys(Object record, Object[] target, int index)}} and {{TypeComparator[] getFlatComparators()}} to return 0 and no type comparators respectively, the {{coGroup}} operator (possibly others) find matching elements although no comparators have been specified.
> In this case, the expected behavior for a CoGroup would be that only elements from one side are supplied in the CoGroup method.



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