viirya commented on a change in pull request #26881: [SPARK-30252][SQL]
Disallow negative scale of Decimal
URL: https://github.com/apache/spark/pull/26881#discussion_r369109161
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/DecimalType.scala
##########
@@ -141,20 +144,26 @@ object DecimalType extends AbstractDataType {
}
private[sql] def fromLiteral(literal: Literal): DecimalType = literal.value
match {
- case v: Short => fromBigDecimal(BigDecimal(v))
- case v: Int => fromBigDecimal(BigDecimal(v))
- case v: Long => fromBigDecimal(BigDecimal(v))
+ case v: Short => fromDecimal(Decimal(BigDecimal(v)))
+ case v: Int => fromDecimal(Decimal(BigDecimal(v)))
+ case v: Long => fromDecimal(Decimal(BigDecimal(v)))
case _ => forType(literal.dataType)
}
- private[sql] def fromBigDecimal(d: BigDecimal): DecimalType = {
- DecimalType(Math.max(d.precision, d.scale), d.scale)
- }
+ private[sql] def fromDecimal(d: Decimal): DecimalType =
DecimalType(d.precision, d.scale)
private[sql] def bounded(precision: Int, scale: Int): DecimalType = {
DecimalType(min(precision, MAX_PRECISION), min(scale, MAX_SCALE))
}
+ private[sql] def checkNegativeScale(scale: Int): Unit = {
+ if (scale < 0 && !SQLConf.get.allowNegativeScaleOfDecimalEnabled) {
+ throw new AnalysisException(s"Negative scale is not allowed: $scale. " +
+ s"You can use
spark.sql.legacy.allowNegativeScaleOfDecimal.enabled=true " +
+ s"to enable legacy mode to allow it.")
Review comment:
nit: no need s"".
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