Akash Nayar created SPARK-56306:
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             Summary: Fix collation-aware PIVOT in Spark
                 Key: SPARK-56306
                 URL: https://issues.apache.org/jira/browse/SPARK-56306
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 4.2.0
            Reporter: Akash Nayar


PivotFirst ignores string collation, causing incorrect NULLs. Fix uses TreeMap 
for non-binary-stable collations.



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