gengliangwang commented on a change in pull request #24849: [SPARK-28018][SQL]
Allow upcasting decimal to double/float
URL: https://github.com/apache/spark/pull/24849#discussion_r292791870
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/DecimalType.scala
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@@ -77,6 +77,7 @@ case class DecimalType(precision: Int, scale: Int) extends
FractionalType {
(precision - scale) >= (dt.precision - dt.scale) && scale >= dt.scale
case dt: IntegralType =>
isWiderThan(DecimalType.forType(dt))
+ // For DoubleType/FloatType, the value can be NaN, PositiveInfinity or
NegativeInfinity.
Review comment:
This PR also added comment to explain why we can't upcast double/float to
decimal.
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