diff --git a/dbms/src/Storages/DeltaMerge/ReadThread/UnorderedInputStream.h b/dbms/src/Storages/DeltaMerge/ReadThread/UnorderedInputStream.h
index a0a040057e7..813f464bea2 100644
--- a/dbms/src/Storages/DeltaMerge/ReadThread/UnorderedInputStream.h
+++ b/dbms/src/Storages/DeltaMerge/ReadThread/UnorderedInputStream.h
@@ -56,25 +56,17 @@ class UnorderedInputStream : public IProfilingBlockInputStream
         LOG_DEBUG(log, "Created, pool_id={} ref_no={}", task_pool->poolId(), ref_no);
     }
 
-    void cancel(bool /*kill*/) override { decreaseRefCount(true); }
-
-    ~UnorderedInputStream() override { decreaseRefCount(false); }
+    ~UnorderedInputStream() override
+    {
+        task_pool->decreaseUnorderedInputStreamRefCount();
+        LOG_DEBUG(log, "Destroy, pool_id={} ref_no={}", task_pool->poolId(), ref_no);
+    }
 
     String getName() const override { return NAME; }
 
     Block getHeader() const override { return header; }
 
 protected:
-    void decreaseRefCount(bool is_cancel)
-    {
-        bool ori = false;
-        if (is_stopped.compare_exchange_strong(ori, true))
-        {
-            task_pool->decreaseUnorderedInputStreamRefCount();
-            LOG_DEBUG(log, "{}, pool_id={} ref_no={}", is_cancel ? "Cancel" : "Destroy", task_pool->poolId(), ref_no);
-        }
-    }
-
     Block readImpl() override
     {
         FilterPtr filter_ignored;
@@ -137,7 +129,5 @@ class UnorderedInputStream : public IProfilingBlockInputStream
     LoggerPtr log;
     int64_t ref_no;
     bool task_pool_added;
-
-    std::atomic_bool is_stopped = false;
 };
 } // namespace DB::DM