Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/6721#discussion_r32702082
--- 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 --
Hmm, because `UnaryMathExpression` has `f: Double => Double` as parameter,
`BIN` can't directly extends it without modification. `BIN` has different input
type (`LONG`) and output type (`STRING`) compared with other expressions (input
and output: `DOUBLE`) based on `UnaryMathExpression`. For now, adding
`AbstractUnaryMathExpression` maybe the simplest approach to solve this?
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