1 files changed, 3 insertions, 0 deletions
diff --git a/src/mongo/db/pipeline/field_path.h b/src/mongo/db/pipeline/field_path.h
index f6f59ad3295..efbda98a55d 100755
--- a/src/mongo/db/pipeline/field_path.h
+++ b/src/mongo/db/pipeline/field_path.h
@@ -83,6 +83,9 @@ namespace mongo {
 
         static const char prefix[];
 
+        /** a FieldPath like this but missing the first element (useful for recursion) */
+        FieldPath tail() const;
+
     private:
         vector<string> vFieldName;
     };