diff --git a/dbms/src/IO/PeekableReadBuffer.cpp b/dbms/src/IO/PeekableReadBuffer.cpp
index 6d70f790b54..f624d8b8104 100644
--- a/dbms/src/IO/PeekableReadBuffer.cpp
+++ b/dbms/src/IO/PeekableReadBuffer.cpp
@@ -268,7 +268,7 @@ bool PeekableReadBuffer::checkpointInOwnMemory() const
     return checkpoint_in_own_memory;
 }
 
-void PeekableReadBuffer::assertCanBeDistructed() const
+void PeekableReadBuffer::assertCanBeDestructed() const
 {
     if (peeked_size && pos != memory.data() + peeked_size)
         throw DB::Exception("There are data, which were extracted from sub-buffer, but not from peekable buffer: "
diff --git a/dbms/src/IO/PeekableReadBuffer.h b/dbms/src/IO/PeekableReadBuffer.h
index d36bb544940..e6079c4f33e 100644
--- a/dbms/src/IO/PeekableReadBuffer.h
+++ b/dbms/src/IO/PeekableReadBuffer.h
@@ -49,7 +49,7 @@ public:
     /// but not from this buffer, so the data will not be lost after destruction of this buffer.
     /// If position is in sub-buffer, returns empty buffer.
     std::shared_ptr<BufferWithOwnMemory<ReadBuffer>> takeUnreadData();
-    void assertCanBeDistructed() const;
+    void assertCanBeDestructed() const;
 
 private:
 
@@ -59,6 +59,7 @@ private:
     inline bool currentlyReadFromOwnMemory() const;
     inline bool checkpointInOwnMemory() const;
 
+    // TODO add unit test for PeekableReadBuffer and remove this method
     void checkStateCorrect() const;
 
     /// Makes possible to append `bytes_to_append` bytes to data in own memory.
@@ -74,4 +75,14 @@ private:
     bool checkpoint_in_own_memory = false;
 };
 
+
+class PeekableReadBufferCheckpoint : boost::noncopyable
+{
+    PeekableReadBuffer & buf;
+public:
+    explicit PeekableReadBufferCheckpoint(PeekableReadBuffer & buf_) : buf(buf_) { buf.setCheckpoint(); }
+    ~PeekableReadBufferCheckpoint() { buf.dropCheckpoint(); }
+
+};
+
 }