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https://issues.apache.org/jira/browse/SPARK-56305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18084448#comment-18084448
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Anupam Yadav commented on SPARK-56305:
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I would like to work on this. Will look at the epic and get better
understanding of the problem
> Fix collation-aware PIVOT in Spark
> ----------------------------------
>
> Key: SPARK-56305
> URL: https://issues.apache.org/jira/browse/SPARK-56305
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.2.0
> Reporter: Stefan Kandic
> Priority: Major
>
> PivotFirst ignores string collation, causing incorrect NULLs. Fix uses
> TreeMap for non-binary-stable collations.
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