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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