Fabian Hueske created FLINK-7239:
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Summary: GroupWindow and OverWindow aggregates do not check
correctly for updating input
Key: FLINK-7239
URL: https://issues.apache.org/jira/browse/FLINK-7239
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Affects Versions: 1.3.1, 1.4.0
Reporter: Fabian Hueske
The streaming table operators for group-window and over-window aggregates do
only support append-only input, i.e., no updates.
However, the {{DataStreamGroupWindowAggregate}} {{DataStreamOverAggregate}}
RelNodes do only check that the input does not have retraction messages which
is only one possible encoding of updates.
We should fix the RelNodes to check if the input is append-only using the
{{UpdatingPlanChecker}} similar to {{DataStreamWindowJoin}}.
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