mgaido91 commented on a change in pull request #25253: [SPARK-28470][SQL] Cast
to decimal throws ArithemticException on overflow
URL: https://github.com/apache/spark/pull/25253#discussion_r307626380
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
##########
@@ -498,22 +499,34 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
b => x.numeric.asInstanceOf[Numeric[Any]].toInt(b).toByte
}
+ private val nullOnOverflow = SQLConf.get.decimalOperationsNullOnOverflow
+
/**
* Change the precision / scale in a given decimal to those set in
`decimalType` (if any),
* returning null if it overflows or modifying `value` in-place and
returning it if successful.
*
* NOTE: this modifies `value` in-place, so don't call it on external data.
*/
private[this] def changePrecision(value: Decimal, decimalType: DecimalType):
Decimal = {
- if (value.changePrecision(decimalType.precision, decimalType.scale)) value
else null
+ if (value.changePrecision(decimalType.precision, decimalType.scale)) {
+ value
+ } else {
+ if (nullOnOverflow) {
+ null
+ } else {
+ throw new ArithmeticException(s"${value.toDebugString} cannot be
represented as " +
+ s"Decimal(${decimalType.precision}, ${decimalType.scale}).")
Review comment:
this is consistent with other similar error messages. We should change it in
all cases, then. WDYT?
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