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-594010285 > In case of the whole stage codegen, you can see the decimal ‘+’ expressions will at some point be larger than what can be contained in dec 38,18 but it gets written out as null. This messes up the end result of the sum and you get wrong results. Still a bit confused. If it gets written out as null, then null + decimal always return null and the final result is null?
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