From 52e0b6886e5ce44feb563a71cceaf4d5fffc8c3a Mon Sep 17 00:00:00 2001
From: Benety Goh <benety@mongodb.com>
Date: Mon, 2 Aug 2021 06:38:59 -0400
Subject: [PATCH] SERVER-58067 fix XCode12 compile warning

---
 src/mongo/db/timeseries/timeseries_dotted_path_support.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mongo/db/timeseries/timeseries_dotted_path_support.cpp b/src/mongo/db/timeseries/timeseries_dotted_path_support.cpp
index 8f2387f908a..e88ac6e20eb 100644
--- a/src/mongo/db/timeseries/timeseries_dotted_path_support.cpp
+++ b/src/mongo/db/timeseries/timeseries_dotted_path_support.cpp
@@ -162,7 +162,7 @@ void _extractAllElementsAlongBucketPath(const BSONObj& obj,
         }
         case 2: {
             // Unbucketing magic happens here.
-            for (const BSONElement e : obj) {
+            for (const BSONElement& e : obj) {
                 std::string subPath = e.fieldName();
                 if (!path.empty()) {
                     subPath.append("." + path);