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https://issues.apache.org/jira/browse/SPARK-38227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-38227:
-----------------------------------
Assignee: Jungtaek Lim
> Apply strict nullability of nested column in time window / session window
> -------------------------------------------------------------------------
>
> Key: SPARK-38227
> URL: https://issues.apache.org/jira/browse/SPARK-38227
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 3.2.1, 3.3.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
>
> In TimeWindow and SessionWindow, we define dataType of these function
> expressions as StructType having two nested columns "start" and "end", which
> is "nullable".
> And we replace these expressions in the analyzer via corresponding rules,
> TimeWindowing for TimeWindow, and SessionWindowing for SessionWindow.
> The rules replace the function expressions with Alias, referring
> CreateNamedStruct. For the value side of CreateNamedStruct, we don't specify
> anything about nullability, which leads to a risk the value side may be
> interpreted (or optimized) as non-nullable, which would make inconsistency.
> We should make sure the nullability of columns in CreateNamedStruct remains
> the same with dataType definition on these function expressions.
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