minor change

velox/exec/tests/HashJoinTest.cpp

@@ -26,6 +26,7 @@
 #include "velox/exec/TableScan.h"
 #include "velox/exec/tests/utils/AssertQueryBuilder.h"
 #include "velox/exec/tests/utils/Cursor.h"
+#include "velox/exec/tests/utils/FlagUpdater.h"
 #include "velox/exec/tests/utils/HiveConnectorTestBase.h"
 #include "velox/exec/tests/utils/PlanBuilder.h"
 #include "velox/exec/tests/utils/TempDirectoryPath.h"
@@ -4671,22 +4672,6 @@ TEST_F(HashJoinTest, dynamicFiltersWithSkippedSplits) {
   }
 }
 
-template <typename T>
-class FlagUpdater {
- public:
-  FlagUpdater(T& flag, const T newValue) : originalValue_(flag), flag_(flag) {
-    flag_ = newValue;
-  }
-
-  ~FlagUpdater() {
-    flag_ = originalValue_;
-  }
-
- private:
-  T originalValue_;
-  T& flag_;
-};
-
 TEST_F(HashJoinTest, dynamicFiltersAppliedToPreloadedSplits) {
   vector_size_t size = 1000;
   const int32_t numSplits = 5;

velox/exec/tests/utils/FlagUpdater.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * 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.
+ */
+#pragma once
+namespace facebook::velox::exec::test {
+
+// Generic RAII class to update GFlag.
+template <typename T>
+class FlagUpdater {
+ public:
+  FlagUpdater(T& flag, const T newValue) : originalValue_(flag), flag_(flag) {
+    flag_ = newValue;
+  }
+
+  ~FlagUpdater() {
+    flag_ = originalValue_;
+  }
+
+ private:
+  T originalValue_;
+  T& flag_;
+};
+
+} // namespace facebook::velox::exec::test