cloud-fan commented on a change in pull request #35848:
URL: https://github.com/apache/spark/pull/35848#discussion_r828097512
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Sum.scala
##########
@@ -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:
I have a different and simpler idea to do abstraction
```
protected def createAddExpr(left: Expression, right: Expression): Expression
= {
Add(left, right, failOnError)
}
```
and here we can do
```
Seq(coalesce(
createAddExpr(coalesce(sum, zero), child.cast(resultType)),
sum))
```
Then `TrySum` can override it
```
val add = super.createAddExpr(left, right)
if (failOnError) TryEval(add) else add
```
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