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https://issues.apache.org/jira/browse/SPARK-28201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-28201.
---------------------------------
Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 25010
[https://github.com/apache/spark/pull/25010]
> Revisit MakeDecimal behavior on overflow
> ----------------------------------------
>
> Key: SPARK-28201
> URL: https://issues.apache.org/jira/browse/SPARK-28201
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Marco Gaido
> Assignee: Marco Gaido
> Priority: Major
> Fix For: 3.0.0
>
>
> As pointed out in
> https://github.com/apache/spark/pull/20350#issuecomment-505997469, in special
> cases of decimal aggregation we are using the `MakeDecimal` operator.
> This operator has a not well defined behavior in case of overflow, namely
> what it does currently is:
> - if codegen is enabled it returns null;
> - in interpreted mode it throws an `IllegalArgumentException`.
> So we should make his behavior uniform with other similar cases and in
> particular we should honor the value of the conf introduced in SPARK-23179
> and behave accordingly, ie.:
> - returning null if the flag is true;
> - throw an `ArithmeticException` if the flag is false.
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