cloud-fan commented on issue #27627: [WIP][SPARK-28067][SQL] Fix incorrect results for decimal aggregate sum by returning null on decimal overflow URL: https://github.com/apache/spark/pull/27627#issuecomment-611308104 > A function implementor would need to know to use DecimalSum instead of Sum and special case it. My main point is to avoid perf regression for other types. We can also put everything in `Sum`, and use `if (is decimal type)` to generate different update/merge expressions for decimal and other types.
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