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63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
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#pragma once
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#include <Common/SharedLibrary.h>
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#include <Dictionaries/DictionaryStructure.h>
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#include <Dictionaries/ExternalResultDescription.h>
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#include <Dictionaries/IDictionarySource.h>
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#include <iostream>
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namespace Poco
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{
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class Logger;
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}
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namespace DB
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{
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struct CStringsHolder;
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/// Allows loading dictionaries from dynamic libraries (.so)
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/// Experimental version
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/// Now supports only uint64 types
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class LibraryDictionarySource final : public IDictionarySource
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{
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public:
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LibraryDictionarySource(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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Block & sample_block,
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const Context & context);
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LibraryDictionarySource(const LibraryDictionarySource & 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(const Columns & key_columns, const std::vector<std::size_t> & requested_rows) override;
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bool isModified() const override;
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bool supportsSelectiveLoad() const override;
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DictionarySourcePtr clone() const override;
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std::string toString() const override;
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private:
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Poco::Logger * log;
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LocalDateTime getLastModification() const;
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const DictionaryStructure dict_struct;
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const std::string config_prefix;
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const std::string path;
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Block sample_block;
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const Context & context;
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SharedLibraryPtr library;
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ExternalResultDescription description;
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std::shared_ptr<CStringsHolder> settings;
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};
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}
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