Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6725#discussion_r32375632
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -90,18 +90,26 @@ abstract class UnaryMathExpression(f: Double => Double,
name: String)
}
/**
+ * A binary expression specifically for math functions that take two input
parameters and
+ * returns one output value.
+ * @param name The short name of the function
+ */
+abstract class AbstractBinaryMathExpression[T, U, V](name: String)
--- End diff --
yes let's not complicate the type hierarchy just for one thing
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