Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/73#discussion_r73208331
--- Diff: query_optimizer/rules/SwapProbeBuild.hpp ---
@@ -0,0 +1,47 @@
+#ifndef QUICKSTEP_QUERY_OPTIMIZER_RULES_SWAP_PROBE_BUILD_HPP_
+#define QUICKSTEP_QUERY_OPTIMIZER_RULES_SWAP_PROBE_BUILD_HPP_
+
+#include <string>
--- End diff --
Add `#include <memory>` as `std::unique_ptr` is used in this file.
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