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https://issues.apache.org/jira/browse/BEAM-9442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía resolved BEAM-9442.
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Resolution: Fixed
> Schema Select does not properly handle nested nullable fields
> -------------------------------------------------------------
>
> Key: BEAM-9442
> URL: https://issues.apache.org/jira/browse/BEAM-9442
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-harness
> Reporter: Reuven Lax
> Assignee: Reuven Lax
> Priority: Major
> Fix For: 2.20.0
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> A select of a nested field should be nullable if any of its parents are
> nullable. So for example, a select of "a.b" should return a field named b
> that is nullable if _either_ of a or b is nullable. Today we only examine b
> to see if the selected fields should be nullable.
> Also the Select transform itself does not properly check for null values, and
> throws NullPointerExceptions when some row values are null.
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