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-523091311 Well, actually mainstream DBs behave differently among each other: - SQLServer returns bigint for a sum of bigint, int for a sum of int, decimal(28,s) for a sum of decimal(p,s); - MySQL returns decimal(38,0) for a sum of int, decimal(41, 0) for a sum of long; - Postgres behaves like after this PR with the flag on, ie. a sum of integers returns a long, while a sum of longs returns a decimal.
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