Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/39#discussion_r68326059
--- Diff: query_optimizer/expressions/WindowAggregateFunction.hpp ---
@@ -0,0 +1,246 @@
+/**
+ * Copyright 2011-2015 Quickstep Technologies LLC.
+ * Copyright 2015 Pivotal Software, Inc.
+ * Copyright 2016, Quickstep Research Group, Computer Sciences
Department,
+ * University of WisconsinâMadison.
+ *
+ * Licensed 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_EXPRESSIONS_WINDOW_AGGREGATE_FUNCTION_HPP_
+#define
QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_WINDOW_AGGREGATE_FUNCTION_HPP_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "query_optimizer/OptimizerTree.hpp"
+#include "query_optimizer/expressions/AttributeReference.hpp"
+#include "query_optimizer/expressions/Expression.hpp"
+#include "query_optimizer/expressions/ExpressionType.hpp"
+#include "query_optimizer/expressions/Scalar.hpp"
+#include "utility/Macros.hpp"
+
+namespace quickstep {
+
+class AggregateFunction;
+class Type;
+
+namespace optimizer {
+namespace expressions {
+
+/** \addtogroup OptimizerExpressions
+ * @{
+ */
+
+struct WindowFrameInfo {
+ /**
+ * @brief Cosntructor.
+ *
+ * @param is_row_in True if this window frame is defined by ROWS, false
if
+ * defined by RANGE.
+ * @param num_preceding_in The number of preceding tuples the window
frame
+ * will cover, -1 means UNBOUNDED.
+ * @param num_following_in The number of following tuples the window
frame
+ * will cover, -1 means UNBOUNDED.
+ **/
+ explicit WindowFrameInfo(const bool is_row_in,
--- End diff --
Please remove `explicit`, as we don't need it.
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