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From "Max Michels (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1599) TypeComperator
Date Mon, 23 Feb 2015 13:37:12 GMT
Max Michels created FLINK-1599:

             Summary: TypeComperator
                 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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