vinodkc commented on code in PR #38146:
URL: https://github.com/apache/spark/pull/38146#discussion_r1013413707


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/maskExpressions.scala:
##########
@@ -0,0 +1,222 @@
+/*
+ * 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.expressions.codegen._
+import org.apache.spark.sql.types.{AbstractDataType, DataType, StringType}
+import org.apache.spark.unsafe.types.UTF8String
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+  usage =
+    """_FUNC_(input[, upperChar, lowerChar, digitChar, otherChar]) - masks the 
given string value""",
+  arguments = """
+    Arguments:
+      * input      - string value to mask. Supported types: STRING, VARCHAR, 
CHAR
+      * upperChar  - character to replace upper-case characters with. Specify 
-1 to retain original character. Default value: 'X'
+      * lowerChar  - character to replace lower-case characters with. Specify 
-1 to retain original character. Default value: 'x'
+      * digitChar  - character to replace digit characters with. Specify -1 to 
retain original character. Default value: 'n'
+      * otherChar  - character to replace all other characters with. Specify 
-1 to retain original character. Default value: -1
+  """,
+  examples = """
+    Examples:
+      > SELECT _FUNC_('abcd-EFGH-8765-4321');
+        xxxx-XXXX-nnnn-nnnn
+      > SELECT _FUNC_('abcd-EFGH-8765-4321', 'Q');
+        xxxx-QQQQ-nnnn-nnnn
+      > SELECT _FUNC_('AbCD123-@$#', 'Q','q');
+        QqQQnnn-@$#
+      > SELECT _FUNC_('AbCD123-@$#');
+        XxXXnnn-@$#
+      > SELECT _FUNC_('AbCD123-@$#', 'Q');
+        QxQQnnn-@$#
+      > SELECT _FUNC_('AbCD123-@$#', 'Q','q');
+        QqQQnnn-@$#
+      > SELECT _FUNC_('AbCD123-@$#', 'Q','q', 'd');
+        QqQQddd-@$#
+      > SELECT _FUNC_('AbCD123-@$#', 'Q','q', 'd', 'o');
+        QqQQdddoooo
+      > SELECT _FUNC_('AbCD123-@$#', -1, 'q', 'd', 'o');
+        AqCDdddoooo
+      > SELECT _FUNC_('AbCD123-@$#', -1,-1, 'd', 'o');
+        AbCDdddoooo
+      > SELECT _FUNC_('AbCD123-@$#', -1,-1, -1, 'o');
+        AbCD123oooo
+      > SELECT _FUNC_(NULL, -1,-1, -1, 'o');

Review Comment:
   Added test cases where  replacement characters are NULL, it will throw an 
analysis exception



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