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https://issues.apache.org/jira/browse/SPARK-40351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630199#comment-17630199
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Tymofii commented on SPARK-40351:
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[~dwsmith1983] make sense. Thank you for pointing out to this doc
> Spark Sum increases the precision of DecimalType arguments by 10
> ----------------------------------------------------------------
>
> Key: SPARK-40351
> URL: https://issues.apache.org/jira/browse/SPARK-40351
> Project: Spark
> Issue Type: Question
> Components: Optimizer
> Affects Versions: 3.2.0
> Reporter: Tymofii
> Priority: Minor
>
> Currently in Spark automatically increases Decimal field by 10 (hard coded
> value) after SUM aggregate operation -
> [https://github.com/apache/spark/blob/branch-3.2/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L1877.]
> There are a couple of questions:
> # Why was 10 chosen as default one?
> # Does it make sense to allow the user to override this value via
> configuration?
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