adelapena commented on code in PR #1892: URL: https://github.com/apache/cassandra/pull/1892#discussion_r1052309343
########## src/java/org/apache/cassandra/cql3/functions/masking/NullMaskingFunction.java: ########## @@ -0,0 +1,64 @@ +/* + * 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.cassandra.cql3.functions.masking; + +import java.nio.ByteBuffer; +import java.util.List; + +import org.apache.cassandra.cql3.functions.FunctionFactory; +import org.apache.cassandra.cql3.functions.FunctionName; +import org.apache.cassandra.cql3.functions.FunctionParameter; +import org.apache.cassandra.cql3.functions.NativeFunction; +import org.apache.cassandra.db.marshal.AbstractType; +import org.apache.cassandra.transport.ProtocolVersion; + +/** + * A {@link MaskingFunction} that always returns a {@code null} of the same type as its single argument. + * <p> + * For example, given a text column named "username", {@code mask_null(username)} will always return {@code null}, + * independently of the actual value of that column. + */ +public class NullMaskingFunction extends MaskingFunction +{ + public static final String NAME = "null"; + + private NullMaskingFunction(FunctionName name, AbstractType<?> inputType) + { + super(name, inputType, inputType); + } + + @Override + public final ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) + { + return null; Review Comment: Yes, the intention here is that the function just removes the cell, as if it didn't exist. I have updated the doc to better reflect that. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
