Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7634#discussion_r35397445
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -110,6 +110,18 @@ private[sql] object BinaryArithmetic {
def unapply(e: BinaryArithmetic): Option[(Expression, Expression)] =
Some((e.left, e.right))
}
+/**
+ * An expression used to wrap the children when promote the precision of
DecimalType to avoid
+ * promote multiple times.
+ */
+case class ChangeDecimalPrecision(child: Expression) extends
UnaryExpression {
--- End diff --
can you put this in decimalFunctions.scala?
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