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Posted to issues@spark.apache.org by "Marco Gaido (JIRA)" <ji...@apache.org> on 2019/07/02 19:43:00 UTC

[jira] [Created] (SPARK-28235) Decimal sum return type

Marco Gaido created SPARK-28235:
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             Summary: 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


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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