[jira] [Created] (FLINK-40949) WindowedUnsliceAssigner reports a NULL window bound as "RowTime field should not be null."

["Martijn Visser (Jira)" <ji...@apache.org>]

Martijn Visser created FLINK-40949:
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             Summary: WindowedUnsliceAssigner reports a NULL window bound as "RowTime field should not be null."
                 Key: FLINK-40949
                 URL: https://issues.apache.org/jira/browse/FLINK-40949
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.20.5, 2.2.1, 2.3.0, 1.19.3, 2.4.0
            Reporter: Martijn Visser


{{UnsliceAssigners.WindowedUnsliceAssigner#createWindow}} throws {{RuntimeException("RowTime field should not be null.")}} when window_start or window_end of an incoming row is NULL (added with FLINK-34100). The text is misleading: this assigner only runs on rows that an upstream window operator produced, where both columns are TIMESTAMP(3) NOT NULL, so a NULL here means an operator or planner defect and not a NULL in the user's rowtime column. {{WatermarkAssignerOperator}} and {{SliceAssigners.AbstractSliceAssigner}} use the same text for a NULL rowtime attribute, which is a data problem the user can fix, and anything that classifies failures by message cannot tell the two apart. {{SliceAssigners.WindowedSliceAssigner}} has no null check at all for the same situation.



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