Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/291#discussion_r136197848
--- Diff: query_optimizer/logical/CopyTo.hpp ---
@@ -0,0 +1,141 @@
+/**
+ * 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.
+ **/
+
+#ifndef QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_COPY_TO_HPP_
+#define QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_COPY_TO_HPP_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "query_optimizer/OptimizerTree.hpp"
+#include "query_optimizer/expressions/AttributeReference.hpp"
+#include "query_optimizer/logical/Logical.hpp"
+#include "query_optimizer/logical/LogicalType.hpp"
+#include "utility/BulkIOConfiguration.hpp"
+#include "utility/Macros.hpp"
+
+#include "glog/logging.h"
+
+namespace quickstep {
+namespace optimizer {
+namespace logical {
+
+/** \addtogroup OptimizerLogical
+ * @{
+ */
+
+class CopyTo;
+typedef std::shared_ptr<const CopyTo> CopyToPtr;
+
+/**
+ * @brief Represents an operation that copies data from a relation to a
text file.
+ */
+class CopyTo : public Logical {
+ public:
+ LogicalType getLogicalType() const override {
+ return LogicalType::kCopyTo;
+ }
+
+ std::string getName() const override {
+ return "CopyTo";
+ }
+
+ /**
+ * @return The input relation whose data is to be exported.
+ */
+ const LogicalPtr& input() const {
+ return input_;
+ }
+
+ /**
+ * @return The name of the file to write the data to.
+ */
+ const std::string& file_name() const {
+ return file_name_;
+ }
+
+ /**
+ * @return The options for this COPY TO statement.
+ */
+ BulkIOConfigurationPtr options() const {
--- End diff --
Updated.
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