mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
#pragma once
|
|
|
|
#include <DB/Dictionaries/IDictionarySource.h>
|
|
#include <DB/Dictionaries/DictionaryStructure.h>
|
|
#include <DB/Dictionaries/ExternalQueryBuilder.h>
|
|
#include <DB/Client/ConnectionPool.h>
|
|
#include <Poco/Util/AbstractConfiguration.h>
|
|
#include <memory>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/** Allows loading dictionaries from local or remote ClickHouse instance
|
|
* @todo use ConnectionPoolWithFailover
|
|
* @todo invent a way to keep track of source modifications
|
|
*/
|
|
class ClickHouseDictionarySource final : public IDictionarySource
|
|
{
|
|
public:
|
|
ClickHouseDictionarySource(const DictionaryStructure & dict_struct_,
|
|
const Poco::Util::AbstractConfiguration & config,
|
|
const std::string & config_prefix,
|
|
const Block & sample_block, Context & context);
|
|
|
|
/// copy-constructor is provided in order to support cloneability
|
|
ClickHouseDictionarySource(const ClickHouseDictionarySource & other);
|
|
|
|
BlockInputStreamPtr loadAll() override;
|
|
|
|
BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
|
|
|
|
BlockInputStreamPtr loadKeys(
|
|
const ConstColumnPlainPtrs & key_columns, const std::vector<size_t> & requested_rows) override;
|
|
|
|
bool isModified() const override { return true; }
|
|
bool supportsSelectiveLoad() const override { return true; }
|
|
|
|
DictionarySourcePtr clone() const override { return std::make_unique<ClickHouseDictionarySource>(*this); }
|
|
|
|
std::string toString() const override;
|
|
|
|
private:
|
|
BlockInputStreamPtr createStreamForSelectiveLoad(const std::string query);
|
|
|
|
const DictionaryStructure dict_struct;
|
|
const std::string host;
|
|
const UInt16 port;
|
|
const std::string user;
|
|
const std::string password;
|
|
const std::string db;
|
|
const std::string table;
|
|
const std::string where;
|
|
ExternalQueryBuilder query_builder;
|
|
Block sample_block;
|
|
Context & context;
|
|
const bool is_local;
|
|
ConnectionPoolPtr pool;
|
|
const std::string load_all_query;
|
|
};
|
|
|
|
}
|