SERVER-18940 Optimise sharded aggregations that are targeted to a single shard

1 files changed, 7 insertions, 1 deletions

diff --git a/src/mongo/db/query/cursor_response.h b/src/mongo/db/query/cursor_response.h
index 9811c29b0ba..ecec7c2eb83 100644
--- a/src/mongo/db/query/cursor_response.h
+++ b/src/mongo/db/query/cursor_response.h
@@ -134,7 +134,8 @@ public:
     CursorResponse(NamespaceString nss,
                    CursorId cursorId,
                    std::vector<BSONObj> batch,
-                   boost::optional<long long> numReturnedSoFar = boost::none);
+                   boost::optional<long long> numReturnedSoFar = boost::none,
+                   boost::optional<BSONObj> writeConcernError = boost::none);
 
     CursorResponse(CursorResponse&& other) = default;
     CursorResponse& operator=(CursorResponse&& other) = default;
@@ -163,6 +164,10 @@ public:
         return _numReturnedSoFar;
     }
 
+    boost::optional<BSONObj> getWriteConcernError() const {
+        return _writeConcernError;
+    }
+
     /**
      * Constructs a CursorResponse from the command BSON response.
      */
@@ -179,6 +184,7 @@ private:
     CursorId _cursorId;
     std::vector<BSONObj> _batch;
     boost::optional<long long> _numReturnedSoFar;
+    boost::optional<BSONObj> _writeConcernError;
 };
 
 }  // namespace mongo