Milan Dankovic created SPARK-55483:
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Summary: 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
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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