kiszk edited a comment on issue #25347: [SPARK-28610][SQL] Allow having a decimal buffer for long sum URL: https://github.com/apache/spark/pull/25347#issuecomment-518012229 @mgaido91 I see. It looks truncation during double sum for average is expected, as described [here](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala#L196-L198)
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