Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/300#discussion_r140575077
--- Diff: query_optimizer/rules/FuseHashSelect.cpp ---
@@ -0,0 +1,91 @@
+/**
+ * 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.
+ **/
+
+#include "query_optimizer/rules/FuseHashSelect.hpp"
+
+#include <algorithm>
+#include <cstddef>
+#include <unordered_set>
+#include <vector>
+
+#include "query_optimizer/expressions/AttributeReference.hpp"
+#include "query_optimizer/expressions/ExpressionUtil.hpp"
+#include "query_optimizer/expressions/PatternMatcher.hpp"
+#include "query_optimizer/expressions/Predicate.hpp"
+#include "query_optimizer/physical/HashJoin.hpp"
+#include "query_optimizer/physical/PatternMatcher.hpp"
+#include "query_optimizer/physical/Physical.hpp"
+#include "query_optimizer/physical/PhysicalType.hpp"
+#include "query_optimizer/physical/Selection.hpp"
+
+#include "glog/logging.h"
--- End diff --
Do we actually use sth from all these headers above? If no, please remove
the unused headers.
---
