mgaido91 commented on issue #25347: [SPARK-28610][SQL] Allow having a decimal buffer for long sum URL: https://github.com/apache/spark/pull/25347#issuecomment-523439380 I think the reason is to have feature parity with Postgres. Using it as return type too supports also cases which would overflow otherwise. I think, since we are guarding it with a flag, it is fine to return a decimal and have wider support.
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