mgaido91 commented on a change in pull request #25033: [SPARK-28224][SQL]
Aggregate sum large decimals
URL: https://github.com/apache/spark/pull/25033#discussion_r299831635
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Sum.scala
##########
@@ -89,5 +90,10 @@ case class Sum(child: Expression) extends
DeclarativeAggregate with ImplicitCast
)
}
- override lazy val evaluateExpression: Expression = sum
+ override lazy val evaluateExpression: Expression = dataType match {
+ case DecimalType.Fixed(precision, scale) =>
+ CheckOverflow(sum, DecimalType(precision, scale),
SQLConf.get.decimalOperationsNullOnOverflow)
Review comment:
yes, sorry, I meant something like this:
```
case _: DecimalType =>
CheckOverflow(sum, resultType,
SQLConf.get.decimalOperationsNullOnOverflow)
```
In this way we do not create a new `DecimalType` and I think it is more
readable... Thanks.
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