Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5616#discussion_r29107401
--- 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
--- End diff --
```scala
if (result.isNaN) null else result
```
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