Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/8415#discussion_r47203695
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -400,8 +400,15 @@ object HiveTypeCoercion {
resultType)
case Divide(e1 @ DecimalType.Expression(p1, s1), e2 @
DecimalType.Expression(p2, s2)) =>
- val resultType = DecimalType.bounded(p1 - s1 + s2 + max(6, s1 +
p2 + 1),
- max(6, s1 + p2 + 1))
+ var intDig = min(DecimalType.MAX_SCALE, p1 - s1 + s2)
+ var decDig = min(DecimalType.MAX_SCALE, max(6, s1 + p2 + 1))
+ val diff = (intDig + decDig) - DecimalType.MAX_SCALE
+ if (diff > 0) {
+ decDig -= diff / 2 + 1
+ intDig = DecimalType.MAX_SCALE - decDig
+ DecimalType.bounded(intDig + decDig, decDig)
+ }
+ val resultType = DecimalType.bounded(intDig + decDig, decDig)
val widerType = widerDecimalType(p1, s1, p2, s2)
--- End diff --
is the `resultType` always tighter than `widerType`?
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