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Posted to issues@flink.apache.org by "Jim Hughes (Jira)" <ji...@apache.org> on 2023/12/05 19:06:00 UTC

[jira] [Created] (FLINK-33756) Missing record with CUMULATE/HOP windows using an optimization

Jim Hughes created FLINK-33756:
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             Summary: Missing record with CUMULATE/HOP windows using an optimization
                 Key: FLINK-33756
                 URL: https://issues.apache.org/jira/browse/FLINK-33756
             Project: Flink
          Issue Type: Bug
            Reporter: Jim Hughes


I have seen an optimization cause a window fail to emit a record.

With the optimization `TABLE_OPTIMIZER_DISTINCT_AGG_SPLIT_ENABLED` set to true, 
the configuration AggregatePhaseStrategy.TWO_PHASE set, using a HOP or CUMULATE window with an offset, a record can be sent which causes one of the multiple active windows to fail to emit a record.

The link code modifies the `WindowAggregateJsonITCase` to demonstrate the case.  
 
The test `testDistinctSplitDisabled` shows the expected behavior.  The test `testDistinctSplitEnabled` tests the above configurations and shows that one record is missing from the output.  



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