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https://issues.apache.org/jira/browse/FLINK-40182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Nuyanzin updated FLINK-40182:
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Summary: ArrayToArray and MapToMap cast rules generate code which might
fail with NPE (was: ArrayToArray and MapToMap generate code which might fail
with NPE)
> ArrayToArray and MapToMap cast rules 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
> Priority: Major
>
> {{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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