Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5616#discussion_r29107413
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathfunctions.scala
---
@@ -0,0 +1,215 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions
+
+import org.apache.spark.sql.catalyst.analysis.UnresolvedException
+import org.apache.spark.sql.types._
+
+abstract class MathematicalExpression(name: String) extends
UnaryExpression with Serializable {
+ self: Product =>
+ type EvaluatedType = Any
+
+ override def dataType: DataType = DoubleType
+ override def foldable: Boolean = child.foldable
+ override def nullable: Boolean = true
+ override def toString: String = s"$name($child)"
+
+ lazy val numeric = child.dataType match {
+ case n: NumericType => n.numeric.asInstanceOf[Numeric[Any]]
+ case other => sys.error(s"Type $other does not support numeric
operations")
+ }
+}
+
+abstract class MathematicalExpressionForDouble(f: Double => Double, name:
String)
+ extends MathematicalExpression(name) { self: Product =>
+ override def eval(input: Row): Any = {
+ val evalE = child.eval(input)
+ if (evalE == null) {
+ null
+ } else {
+ val result = f(numeric.toDouble(evalE))
+ if (result.isNaN) null
+ else result
+ }
+ }
+}
+
+abstract class MathematicalExpressionForInt(f: Int => Int, name: String)
+ extends MathematicalExpression(name) { self: Product =>
+ override def dataType: DataType = IntegerType
+
+ override def eval(input: Row): Any = {
+ val evalE = child.eval(input)
+ if (evalE == null) {
+ null
+ } else {
+ f(numeric.toInt(evalE))
+ }
+ }
+}
+
+abstract class MathematicalExpressionForFloat(f: Float => Float, name:
String)
+ extends MathematicalExpression(name) { self: Product =>
+
+ override def dataType: DataType = FloatType
+
+ override def eval(input: Row): Any = {
+ val evalE = child.eval(input)
+ if (evalE == null) {
+ null
+ } else {
+ val result = f(numeric.toFloat(evalE))
+ if (result.isNaN) null
+ else result
+ }
+ }
+}
+
+abstract class MathematicalExpressionForLong(f: Long => Long, name: String)
+ extends MathematicalExpression(name) { self: Product =>
+
+ override def dataType: DataType = LongType
+
+ override def eval(input: Row): Any = {
+ val evalE = child.eval(input)
+ if (evalE == null) {
+ null
+ } else {
+ f(numeric.toLong(evalE))
+ }
+ }
+}
+
+case class Sin(child: Expression) extends
MathematicalExpressionForDouble(math.sin, "SIN")
+
+case class Asin(child: Expression) extends
MathematicalExpressionForDouble(math.asin, "ASIN")
+
+case class Sinh(child: Expression) extends
MathematicalExpressionForDouble(math.sinh, "SINH")
+
+case class Cos(child: Expression) extends
MathematicalExpressionForDouble(math.cos, "COS")
+
+case class Acos(child: Expression) extends
MathematicalExpressionForDouble(math.acos, "ACOS")
+
+case class Cosh(child: Expression) extends
MathematicalExpressionForDouble(math.cosh, "COSH")
+
+case class Tan(child: Expression) extends
MathematicalExpressionForDouble(math.tan, "TAN")
+
+case class Atan(child: Expression) extends
MathematicalExpressionForDouble(math.atan, "ATAN")
+
+case class Tanh(child: Expression) extends
MathematicalExpressionForDouble(math.tanh, "TANH")
+
+case class Ceil(child: Expression) extends
MathematicalExpressionForDouble(math.ceil, "CEIL")
+
+case class Floor(child: Expression) extends
MathematicalExpressionForDouble(math.floor, "FLOOR")
+
+case class Rint(child: Expression) extends
MathematicalExpressionForDouble(math.rint, "ROUND")
+
+case class Cbrt(child: Expression) extends
MathematicalExpressionForDouble(math.cbrt, "CBRT")
+
+case class Signum(child: Expression) extends
MathematicalExpressionForDouble(math.signum, "SIGNUM")
+
+case class ISignum(child: Expression) extends
MathematicalExpressionForInt(math.signum, "ISIGNUM")
+
+case class FSignum(child: Expression) extends
MathematicalExpressionForFloat(math.signum, "FSIGNUM")
+
+case class LSignum(child: Expression) extends
MathematicalExpressionForLong(math.signum, "LSIGNUM")
+
+case class ToDegrees(child: Expression)
+ extends MathematicalExpressionForDouble(math.toDegrees, "DEGREES")
+
+case class ToRadians(child: Expression)
+ extends MathematicalExpressionForDouble(math.toRadians, "RADIANS")
+
+case class Log(child: Expression) extends
MathematicalExpressionForDouble(math.log, "LOG")
+
+case class Log10(child: Expression) extends
MathematicalExpressionForDouble(math.log10, "LOG10")
+
+case class Log1p(child: Expression) extends
MathematicalExpressionForDouble(math.log1p, "LOG1P")
+
+case class Exp(child: Expression) extends
MathematicalExpressionForDouble(math.exp, "EXP")
+
+case class Expm1(child: Expression) extends
MathematicalExpressionForDouble(math.expm1, "EXPM1")
+
+abstract class BinaryMathExpression(f: (Double, Double) => Double, name:
String)
--- End diff --
i'd pull this up so all the abstract classes are defined up front.
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