Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/6814#discussion_r32847142
--- 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 --
However, as decimal type in Hive is based on Java's BigDecimal. As I
tested, Hive can output the accurate result of `select CAST(9223372036854775807
as DECIMAL(38,0)) * CAST(9223372036854775807 as DECIMAL(38,0));`
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