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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