SERVER-41294 shard filtering for $sb

1 files changed, 57 insertions, 0 deletions

diff --git a/src/mongo/db/exec/shard_filterer_impl.h b/src/mongo/db/exec/shard_filterer_impl.h
new file mode 100644
index 00000000000..d729bb96b18
--- /dev/null
+++ b/src/mongo/db/exec/shard_filterer_impl.h
@@ -0,0 +1,57 @@
+/**
+ *    Copyright (C) 2019-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 "mongo/db/exec/shard_filterer.h"
+#include "mongo/db/matcher/matchable.h"
+#include "mongo/db/s/scoped_collection_metadata.h"
+
+namespace mongo {
+
+class ShardFiltererImpl : public ShardFilterer {
+public:
+    ShardFiltererImpl(ScopedCollectionMetadata md);
+
+    DocumentBelongsResult documentBelongsToMe(const MatchableDocument& doc) const override;
+
+    bool isCollectionSharded() const override {
+        return _metadata->isSharded();
+    }
+
+    const KeyPattern& getKeyPattern() const override {
+        invariant(_keyPattern);
+        return _keyPattern->getKeyPattern();
+    }
+
+private:
+    ScopedCollectionMetadata _metadata;
+    boost::optional<ShardKeyPattern> _keyPattern;
+};
+}  // namespace mongo