Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/6721#discussion_r32702596
--- 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 --
but we still list it in math functions? It might look inconsistent? Or
should we create another abstract class like `UnaryGeneralMathExpression` based
on `UnaryExpression` alongside current `UnaryMathExpression`?
Or just like you said, we directly let `BIN` inherit `UnaryExpression` and
`ExpectsInputTypes`?
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