Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/6779#discussion_r32377995
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -0,0 +1,58 @@
+/*
+ * 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.catalyst.analysis.TypeCheckResult
+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 {
+
+ override def dataType: DataType = StringType
+
+ override def checkInputDataTypes(): TypeCheckResult =
+ if (child.dataType == StringType || child.dataType == BinaryType) {
--- End diff --
@chenghao-intel I think it again and maybe it would be better if we expect
BinaryType here. the MD5 function should be applicable to any type of data as
long as they can cast to Binary. For uft8string, casting into binary is natural.
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