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https://issues.apache.org/jira/browse/SPARK-55483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18057826#comment-18057826
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Milan Dankovic commented on SPARK-55483:
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I am working on this.
> Fix NullPointerException from PhysicalArrayType
> -----------------------------------------------
>
> Key: SPARK-55483
> URL: https://issues.apache.org/jira/browse/SPARK-55483
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 4.2.0
> Reporter: Milan Dankovic
> Priority: Major
>
> When a {{PIVOT}} query uses a non-atomic pivot column (struct, array),
> {{PivotFirst}} stores pivot values in a {{TreeMap}} with a comparison-based
> ordering. If the pivot column contains null values (e.g., from a GROUP BY
> null group), the {{TreeMap.getOrElse}} lookup calls {{{}compare(null,
> existingKey){}}}, which throws a {{{}NullPointerException{}}}.
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