skambha commented on a change in pull request #27627:
URL: https://github.com/apache/spark/pull/27627#discussion_r433397162
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Sum.scala
##########
@@ -62,38 +62,74 @@ case class Sum(child: Expression) extends
DeclarativeAggregate with ImplicitCast
private lazy val sum = AttributeReference("sum", sumDataType)()
+ private lazy val isEmpty = AttributeReference("isEmpty", BooleanType,
nullable = false)()
+
private lazy val zero = Literal.default(sumDataType)
- override lazy val aggBufferAttributes = sum :: Nil
+ override lazy val aggBufferAttributes = resultType match {
+ case _: DecimalType => sum :: isEmpty :: Nil
+ case _ => sum :: Nil
+ }
- override lazy val initialValues: Seq[Expression] = Seq(
- /* sum = */ Literal.create(null, sumDataType)
- )
+ override lazy val initialValues: Seq[Expression] = resultType match {
+ case _: DecimalType => Seq(Literal(null, resultType), Literal(true,
BooleanType))
+ case _ => Seq(Literal(null, resultType))
+ }
override lazy val updateExpressions: Seq[Expression] = {
if (child.nullable) {
- Seq(
- /* sum = */
- coalesce(coalesce(sum, zero) + child.cast(sumDataType), sum)
- )
+ val updateSumExpr = coalesce(coalesce(sum, zero) +
child.cast(sumDataType), sum)
+ resultType match {
+ case _: DecimalType =>
+ Seq(updateSumExpr, isEmpty && child.isNull)
+ case _ => Seq(updateSumExpr)
+ }
} else {
- Seq(
- /* sum = */
- coalesce(sum, zero) + child.cast(sumDataType)
- )
+ val updateSumExpr = coalesce(sum, zero) + child.cast(sumDataType)
+ resultType match {
+ case _: DecimalType =>
+ Seq(updateSumExpr, Literal(false, BooleanType))
+ case _ => Seq(updateSumExpr)
+ }
}
}
+ /**
+ * For decimal type:
+ * If isEmpty is false and if sum is null, then it means we have an overflow.
+ *
+ * update of the sum is as follows:
+ * Check if either portion of the left.sum or right.sum has overflowed
+ * If it has, then the sum value will remain null.
+ * If it did not have overflow, then add the sum.left and sum.right and
check for overflow.
Review comment:
done.
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