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-595330926 Note: the semantic of most aggregate functions are skipping nulls. So sum will skip null inputs, and overflow doesn't return null (also true for decimal), so `updateExpressions` is fine.
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