cloud-fan commented on issue #25347: [SPARK-28610][SQL] Allow having a decimal buffer for long sum URL: https://github.com/apache/spark/pull/25347#issuecomment-522569449 We can create the coarser flag later. For this PR, in general LGTM, but let's make the story about sum completed. Is it true that, in the mainstream databases, sum of long returns decimal and sum of other integral types return long? Or do they always return decimal for sum?
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