ClickHouse/dbms/src/DataStreams/IBlockStream_fwd.h

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#pragma once
#include <memory>
#include <vector>
namespace DB
{
class IBlockInputStream;
class IBlockOutputStream;
using BlockInputStreamPtr = std::shared_ptr<IBlockInputStream>;
using BlockInputStreams = std::vector<BlockInputStreamPtr>;
using BlockOutputStreamPtr = std::shared_ptr<IBlockOutputStream>;
}