join-reduce optimization.

1 files changed, 6 insertions, 0 deletions

diff --git a/library/cpp/yt/memory/shared_range.h b/library/cpp/yt/memory/shared_range.h
index 592902fe7a..c67e40fa05 100644
--- a/library/cpp/yt/memory/shared_range.h
+++ b/library/cpp/yt/memory/shared_range.h
@@ -42,6 +42,12 @@ public:
     TSharedRange()
     { }
 
+    //! Constructs an empty TSharedRange from a nullptr expression.
+    TSharedRange(nullptr_t)
+        : TRange<T>(nullptr, 0UL)
+        , Holder_(nullptr)
+    { }
+
     //! Constructs a TSharedRange from TRange.
     TSharedRange(TRange<T> range, TSharedRangeHolderPtr holder)
         : TRange<T>(range)