mickjermsurawong-stripe commented on a change in pull request #25033:
[SPARK-28224][SQL] Aggregate sum large decimals
URL: https://github.com/apache/spark/pull/25033#discussion_r300536275
##########
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:
Updated to using matched case because `resultType` is still a generic
DataType and not Decimal type
```
override lazy val evaluateExpression: Expression = resultType match {
case d: DecimalType => CheckOverflow(sum, d,
SQLConf.get.decimalOperationsNullOnOverflow)
case _ => sum
}
```
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