From f979ce31cab13df8f04608f340154f220c94cff3 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Mon, 3 Feb 2020 03:03:59 +0300
Subject: [PATCH] Add NullWriteBuffer

---
 dbms/src/IO/NullWriteBuffer.cpp | 16 ++++++++++++++++
 dbms/src/IO/NullWriteBuffer.h   | 18 ++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 dbms/src/IO/NullWriteBuffer.cpp
 create mode 100644 dbms/src/IO/NullWriteBuffer.h

diff --git a/dbms/src/IO/NullWriteBuffer.cpp b/dbms/src/IO/NullWriteBuffer.cpp
new file mode 100644
index 0000000000..035259d48c
--- /dev/null
+++ b/dbms/src/IO/NullWriteBuffer.cpp
@@ -0,0 +1,16 @@
+#include <IO/NullWriteBuffer.h>
+
+
+namespace DB
+{
+
+NullWriteBuffer::NullWriteBuffer(size_t buf_size, char * existing_memory, size_t alignment)
+    : BufferWithOwnMemory<WriteBuffer>(buf_size, existing_memory, alignment)
+{
+}
+
+void NullWriteBuffer::nextImpl()
+{
+}
+
+}
diff --git a/dbms/src/IO/NullWriteBuffer.h b/dbms/src/IO/NullWriteBuffer.h
new file mode 100644
index 0000000000..233268474d
--- /dev/null
+++ b/dbms/src/IO/NullWriteBuffer.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <IO/WriteBuffer.h>
+#include <IO/BufferWithOwnMemory.h>
+#include <boost/noncopyable.hpp>
+
+namespace DB
+{
+
+/// Simply do nothing, can be used to measure amount of written bytes.
+class NullWriteBuffer : public BufferWithOwnMemory<WriteBuffer>, boost::noncopyable
+{
+public:
+    NullWriteBuffer(size_t buf_size = 16<<10, char * existing_memory = nullptr, size_t alignment = false);
+    void nextImpl() override;
+};
+
+}
-- 
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