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-595112843 Ideally, under ANSI mode, decimal sum should also fail if overflows. It's hard to fail at the partial aggregate side, as we don't have a chance to check overflow before shuffling the aggregate buffer row. We can fail at the final aggregate side: If the value is null and `isEmpty` is false, fail with the overflow exception.
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