SERVER-63665 add compilation target for server-side rewrites

4 files changed, 154 insertions, 0 deletions

diff --git a/src/mongo/db/query/fle/SConscript b/src/mongo/db/query/fle/SConscript
new file mode 100644
index 00000000000..bf3f91f998f
--- /dev/null
+++ b/src/mongo/db/query/fle/SConscript
@@ -0,0 +1,23 @@
+Import("env")
+
+env = env.Clone()
+
+env.Library(
+    target="query_fle_server",
+    source=[
+        'server_rewrite.cpp',
+    ],
+    LIBDEPS=[
+        '$BUILD_DIR/mongo/db/matcher/expressions',
+    ]
+)
+
+env.CppUnitTest(
+    target="fle_server_rewrite_test",
+    source=[
+        "server_rewrite_test.cpp",
+    ],
+    LIBDEPS=[
+        "query_fle_server",
+    ],
+)
diff --git a/src/mongo/db/query/fle/server_rewrite.cpp b/src/mongo/db/query/fle/server_rewrite.cpp
new file mode 100644
index 00000000000..a0eb609781c
--- /dev/null
+++ b/src/mongo/db/query/fle/server_rewrite.cpp
@@ -0,0 +1,42 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/db/query/fle/server_rewrite.h"
+#include <memory>
+
+namespace mongo::fle {
+
+/**
+ * Placeholder function to make sure the compilation unit works.
+ * TODO SERVER-63294: Turn this into an actual function.
+ */
+std::unique_ptr<MatchExpression> rewriteMatchExpression(std::unique_ptr<MatchExpression> me) {
+    return me;
+}
+}  // namespace mongo::fle
diff --git a/src/mongo/db/query/fle/server_rewrite.h b/src/mongo/db/query/fle/server_rewrite.h
new file mode 100644
index 00000000000..8707704366d
--- /dev/null
+++ b/src/mongo/db/query/fle/server_rewrite.h
@@ -0,0 +1,40 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "mongo/db/matcher/expression.h"
+
+namespace mongo::fle {
+
+std::unique_ptr<MatchExpression> rewriteMatchExpression(std::unique_ptr<MatchExpression> me);
+
+}
diff --git a/src/mongo/db/query/fle/server_rewrite_test.cpp b/src/mongo/db/query/fle/server_rewrite_test.cpp
new file mode 100644
index 00000000000..1c72a6cdd52
--- /dev/null
+++ b/src/mongo/db/query/fle/server_rewrite_test.cpp
@@ -0,0 +1,49 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include <memory>
+
+#include "mongo/db/matcher/expression_leaf.h"
+#include "mongo/unittest/unittest.h"
+#include "mongo/util/assert_util.h"
+#include "server_rewrite.h"
+
+namespace mongo {
+namespace {
+
+// Placeholder test for placeholder function to make sure compilation unit works.
+// TODO SERVER-63294: replace this unit test with tests that check the actual behavior.
+TEST(FLE2ServerRewrites, ServerRewriteIdentity) {
+    auto me = std::make_unique<EqualityMatchExpression>("_id"_sd, Value(1));
+    auto expected = EqualityMatchExpression("_id"_sd, Value(1));
+    auto result = fle::rewriteMatchExpression(std::move(me));
+    ASSERT_EQUALS(expected.path(), result->path());
+}
+}  // namespace
+}  // namespace mongo