ClickHouse/dbms/include/DB/Dictionaries/MongoDBBlockInputStream.h

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#pragma once
#include <DB/Core/Block.h>
#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/Dictionaries/ExternalResultDescription.h>
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namespace Poco
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{
namespace MongoDB
{
class Connection;
class Cursor;
}
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}
namespace DB
{
/// Converts MongoDB Cursor to a stream of Blocks
class MongoDBBlockInputStream final : public IProfilingBlockInputStream
{
public:
MongoDBBlockInputStream(
std::shared_ptr<Poco::MongoDB::Connection> & connection_,
std::unique_ptr<Poco::MongoDB::Cursor> cursor_,
const Block & sample_block,
const size_t max_block_size);
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~MongoDBBlockInputStream() override;
String getName() const override { return "MongoDB"; }
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String getID() const override;
private:
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Block readImpl() override;
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static void insertDefaultValue(IColumn * column, const IColumn & sample_column)
{
column->insertFrom(sample_column, 0);
}
std::shared_ptr<Poco::MongoDB::Connection> connection;
std::unique_ptr<Poco::MongoDB::Cursor> cursor;
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const size_t max_block_size;
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ExternalResultDescription description;
bool all_read = false;
};
}