Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7605#discussion_r35357367
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -88,6 +88,16 @@ abstract class BinaryArithmetic extends BinaryOperator {
override def dataType: DataType = left.dataType
+ // Whether the dataType is promoted or not, we should only promote
DecimalType once
+ var decimalPromoted: Boolean = false
--- End diff --
The HiveTypeCoercion will cast the children to increase the precision and
scale, this should be done only once. Currently, we rely on turning them into
Unlimited decimal.
I haven't figure out a better to do it, anyway.
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