Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/6814#discussion_r32844941
--- 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 --
OK. I just found their results are different due to the `MathContext`. As
@davies said, its precision is 34. Since we ask to print the `unscaledValue`,
so the scale -4 is not applied on the value. So this should not be a bug. Maybe
we don't need to do this modification.
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