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https://issues.apache.org/jira/browse/SPARK-28235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28235:
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Assignee: (was: Apache Spark)
> Decimal sum return type
> -----------------------
>
> Key: SPARK-28235
> URL: https://issues.apache.org/jira/browse/SPARK-28235
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Marco Gaido
> Priority: Major
>
> Our implementation of decimal operations follows SQLServer behavior. As per
> https://docs.microsoft.com/it-it/sql/t-sql/functions/sum-transact-sql?view=sql-server-2017,
> the result of sum operation should be `DECIMAL(38, s)` while currently we
> are setting it to `DECIMAL(10 + p, s)`. This means that with large datasets,
> we may incur in overflow, even though we may have been able to represent the
> value with higher precision and SQLServer returns correct results in that
> case.
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