Marco Gaido created SPARK-28201:
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Summary: 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
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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