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