gengliangwang commented on a change in pull request #35848:
URL: https://github.com/apache/spark/pull/35848#discussion_r828243966
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Sum.scala
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@@ -110,9 +95,10 @@ case class Sum(
// in case the input is nullable. The `sum` can only be null if there
is no value, as
// non-decimal type can produce overflowed value under non-ansi mode.
if (child.nullable) {
Review comment:
yeah, when overflow happens, the result of update becomes
`child.cast(resultType)`
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