Fabian Hueske created FLINK-3254:
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Summary: CombineFunction interface not respected
Key: FLINK-3254
URL: https://issues.apache.org/jira/browse/FLINK-3254
Project: Flink
Issue Type: Bug
Components: DataSet API
Affects Versions: 0.10.1, 1.0.0
Reporter: Fabian Hueske
Priority: Blocker
Fix For: 1.0.0
The DataSet API offers a {{CombineFunction}} interface, which differs from the
{{GroupCombineFunction}} interface by being restricted to return a single value
instead of returning arbitrary many values through a {{Collector}}.
The JavaDocs of the {{GroupCombineFunction}} point to the {{CombineFunction}}
interface, advertising it as more efficient.
However, the {{CombineFunction}} interface is nor respected by Flink, i.e., a
{{GroupReduceFunction}} that implements this interface is executed without
leveraging the combine method.
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