Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6710#discussion_r32049326
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -32,9 +38,94 @@ trait FunctionRegistry {
def conf: CatalystConf
}
+
+object FunctionRegistry {
+
+ type FunctionBuilder = Seq[Expression] => Expression
+
+ val expressions: Map[String, FunctionBuilder] = Map(
+ // Non aggregate functions
+ expression[Abs]("abs"),
+ expression[CreateArray]("array"),
+ expression[Coalesce]("coalesce"),
+ expression[Explode]("explode"),
+ expression[Lower]("lower"),
+ expression[Substring]("substr"),
+ expression[Substring]("substring"),
+ expression[Rand]("rand"),
+ expression[Randn]("randn"),
+ expression[CreateStruct]("struct"),
+ expression[Sqrt]("sqrt"),
+ expression[Upper]("upper"),
+
+ // Math functions
+ expression[Acos]("acos"),
+ expression[Asin]("asin"),
+ expression[Atan]("atan"),
+ expression[Atan2]("atan2"),
+ expression[Cbrt]("cbrt"),
+ expression[Ceil]("ceil"),
+ expression[Cos]("cos"),
+ expression[Exp]("exp"),
+ expression[Expm1]("expm1"),
+ expression[Floor]("floor"),
+ expression[Hypot]("hypot"),
+ expression[Log]("log"),
+ expression[Log10]("log10"),
+ expression[Log1p]("log1p"),
+ expression[Pow]("pow"),
+ expression[Rint]("rint"),
+ expression[Signum]("signum"),
+ expression[Sin]("sin"),
+ expression[Sinh]("sinh"),
+ expression[Tan]("tan"),
+ expression[Tanh]("tanh"),
+ expression[ToDegrees]("todegrees"),
+ expression[ToRadians]("toradians"),
+
+ // aggregate functions
+ expression[Average]("avg"),
+ expression[Count]("count"),
+ expression[First]("first"),
+ expression[Last]("last"),
+ expression[Max]("max"),
+ expression[Min]("min"),
+ expression[Sum]("sum")
+ )
+
+ /** See usage above. */
+ private def expression[T <: Expression](name: String)
--- End diff --
no they are not always the same, e.g. "avg" vs "Average".
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