Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6779#discussion_r32293367
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -0,0 +1,52 @@
+/*
+ * 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 java.security.MessageDigest
+
+import org.apache.commons.codec.digest.DigestUtils
+import org.apache.spark.sql.types.{BinaryType, StringType, DataType}
+import org.apache.spark.unsafe.types.UTF8String
+
+/**
+ * A function that calculates an MD5 128-bit checksum for the string or
binary.
+ * Defined for String and Binary types.
+ */
+case class Md5(child: Expression)
+ extends UnaryExpression with ExpectsInputTypes {
+
+ override def dataType: DataType = StringType
+
+ override def expectedChildTypes: Seq[DataType] =
+ if (child.dataType == BinaryType) Seq(BinaryType) else Seq(StringType)
+
+ override def children: Seq[Expression] = child :: Nil
+
+ override def eval(input: Row): Any = {
+ val value = child.eval(input)
+ if (value == null) {
+ null
+ } else if (child.dataType == BinaryType) {
+
UTF8String.fromString(DigestUtils.md5Hex(value.asInstanceOf[Array[Byte]]))
+ } else {
+
UTF8String.fromString(DigestUtils.md5Hex(value.asInstanceOf[UTF8String].getBytes))
+ }
+ }
+
+ override def toString: String = s"md5($child)"
--- End diff --
upper case MD5
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