Sergey Nuyanzin created FLINK-40182:
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Summary: ArrayToArray and MapToMap generate code which might fail
with NPE
Key: FLINK-40182
URL: https://issues.apache.org/jira/browse/FLINK-40182
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Reporter: Sergey Nuyanzin
Assignee: Sergey Nuyanzin
{{ArrayToArrayCastRule}}, {{MapToMapAndMultisetToMultisetCastRule}} generate
code that trusted the target type's declared NOT NULL nullability instead of
checking the actual runtime value. When the source array/map element was
actually null (a cast doesn't enforce constraints, so a NOT NULL target type is
not a runtime guarantee), the generated code would either throw an NPE (e.g.,
unboxing a null) or, for primitive-backed arrays, silently write a default
value (e.g., 0) instead of preserving/rejecting the null — masking data
corruption.
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