Max Michels created FLINK-1599:
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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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