Jark Wu created FLINK-21305:
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Summary: Cumulative window should accumulate late events belonging
to the cleaned slice
Key: FLINK-21305
URL: https://issues.apache.org/jira/browse/FLINK-21305
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Reporter: Jark Wu
Fix For: 1.13.0
Currently, the CUMULATE window drops elements belonging to the cleaned slices.
This will lead to more inaccurate result than without slicing optimization.
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