register function

Author: adrian-wang

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala

@@ -106,13 +106,15 @@ object FunctionRegistry {
     expression[Cbrt]("cbrt"),
     expression[Ceil]("ceil"),
     expression[Cos]("cos"),
+    expression[E]("e"),
     expression[Exp]("exp"),
     expression[Expm1]("expm1"),
     expression[Floor]("floor"),
     expression[Hypot]("hypot"),
     expression[Log]("log"),
     expression[Log10]("log10"),
     expression[Log1p]("log1p"),
+    expression[Pi]("pi"),
     expression[Pow]("pow"),
     expression[Rint]("rint"),
     expression[Signum]("signum"),