ClickHouse/dbms/DataStreams/NullBlockInputStream.h

#pragma once

#include <DataStreams/IBlockInputStream.h>


namespace DB
{

/// Empty stream of blocks of specified structure.
class NullBlockInputStream : public IBlockInputStream
{
public:
    NullBlockInputStream(const Block & header_) : header(header_) {}

    Block getHeader() const override { return header; }
    String getName() const override { return "Null"; }

private:
    Block header;

    Block readImpl() override { return {}; }
};

}