Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6721#discussion_r32702212
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -51,16 +54,28 @@ abstract class LeafMathExpression(c: Double, name:
String)
* @param f The math function.
* @param name The short name of the function
*/
-abstract class UnaryMathExpression(f: Double => Double, name: String)
+abstract class AbstractUnaryMathExpression[T, U](name: String)
--- End diff --
Maybe we could don't let `BIN` inherit from `UnaryMathExpression`, they
don't have much in common. How do yo think?
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