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-rw-r--r--src/mongo/db/index/s2_bucket_access_method.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mongo/db/index/s2_bucket_access_method.cpp b/src/mongo/db/index/s2_bucket_access_method.cpp
index 0da4cdc6f63..b9e926a753b 100644
--- a/src/mongo/db/index/s2_bucket_access_method.cpp
+++ b/src/mongo/db/index/s2_bucket_access_method.cpp
@@ -125,7 +125,7 @@ void S2BucketAccessMethod::doGetKeys(OperationContext* opCtx,
KeyStringSet* keys,
KeyStringSet* multikeyMetadataKeys,
MultikeyPaths* multikeyPaths,
- boost::optional<RecordId> id) const {
+ const boost::optional<RecordId>& id) const {
ExpressionKeysPrivate::getS2Keys(pooledBufferBuilder,
obj,
_descriptor->keyPattern(),