Github user wangyum commented on a diff in the pull request:
https://github.com/apache/spark/pull/22419#discussion_r219660644
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala ---
@@ -413,6 +413,7 @@ object Decimal {
val ROUND_HALF_EVEN = BigDecimal.RoundingMode.HALF_EVEN
val ROUND_CEILING = BigDecimal.RoundingMode.CEILING
val ROUND_FLOOR = BigDecimal.RoundingMode.FLOOR
+ val ROUND_DOWN = BigDecimal.RoundingMode.DOWN
--- End diff --
I added it and seem do not need change `longVal`. This test case can
passed.
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