Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/6814#discussion_r32848497 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala --- @@ -261,7 +261,7 @@ final class Decimal extends Ordered[Decimal] with Serializable { def - (that: Decimal): Decimal = Decimal(toBigDecimal - that.toBigDecimal) - def * (that: Decimal): Decimal = Decimal(toBigDecimal * that.toBigDecimal) + def * (that: Decimal): Decimal = Decimal(toJavaBigDecimal.multiply(that.toJavaBigDecimal)) --- End diff -- It can't. But `85070591730234615847396907784232501249` can be handled by precision 38. As the `MathContext` has only precision 34, we will have scale -4 and get different result.
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