cloud-fan commented on a change in pull request #26881: [SPARK-30252][SQL]
Disallow negative scale of Decimal under ansi mode
URL: https://github.com/apache/spark/pull/26881#discussion_r364192439
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/DecimalType.scala
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@@ -148,13 +152,28 @@ object DecimalType extends AbstractDataType {
}
private[sql] def fromBigDecimal(d: BigDecimal): DecimalType = {
- DecimalType(Math.max(d.precision, d.scale), d.scale)
+ fromJavaBigDecimal(d.underlying())
+ }
+
+ private[sql] def fromJavaBigDecimal(d: JavaBigDecimal): DecimalType = {
+ val (precision, scale) = if (d.scale < 0 && SQLConf.get.ansiEnabled) {
+ (d.precision - d.scale, 0)
+ } else {
+ (d.precision, d.scale)
+ }
+ DecimalType(Math.max(precision, scale), scale)
Review comment:
do we still need `Math.max(precision, scale)`? seems it's always `precision`
now.
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