Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/291#discussion_r136153634
--- Diff: utility/BulkIOConfiguration.hpp ---
@@ -0,0 +1,198 @@
+/**
+ * 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_UTILITY_BULK_IO_CONFIGURATION_HPP_
+#define QUICKSTEP_UTILITY_BULK_IO_CONFIGURATION_HPP_
+
+#include <memory>
+#include <string>
+
+#include "utility/Macros.hpp"
+
+#include "glog/logging.h"
+
+namespace quickstep {
+
+/**
+ * @brief External file format for bulk I/O.
+ */
+enum class BulkIOFormat {
+ kCSV,
--- End diff --
Change to `kCSV = 0,`. Personally, prefer to use `kCsv`.
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