mirror of
https://github.com/ClickHouse/ClickHouse.git
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87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#pragma once
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#include <DB/Core/Field.h>
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#include <DB/Core/StringRef.h>
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#include <Poco/Util/XMLConfiguration.h>
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#include <DB/Common/PODArray.h>
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#include <memory>
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#include <chrono>
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namespace DB
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{
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class IDictionarySource;
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struct IDictionaryBase;
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using DictionaryPtr = std::unique_ptr<IDictionaryBase>;
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struct DictionaryLifetime;
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struct DictionaryStructure;
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class ColumnString;
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struct IDictionaryBase
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{
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using id_t = std::uint64_t;
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virtual std::exception_ptr getCreationException() const = 0;
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virtual std::string getName() const = 0;
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virtual std::string getTypeName() const = 0;
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virtual std::size_t getBytesAllocated() const = 0;
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virtual std::size_t getQueryCount() const = 0;
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virtual double getHitRate() const = 0;
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virtual std::size_t getElementCount() const = 0;
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virtual double getLoadFactor() const = 0;
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virtual bool isCached() const = 0;
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virtual DictionaryPtr clone() const = 0;
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virtual const IDictionarySource * getSource() const = 0;
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virtual const DictionaryLifetime & getLifetime() const = 0;
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virtual const DictionaryStructure & getStructure() const = 0;
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virtual std::chrono::time_point<std::chrono::system_clock> getCreationTime() const = 0;
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virtual bool isInjective(const std::string & attribute_name) const = 0;
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virtual ~IDictionaryBase() = default;
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};
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struct IDictionary : IDictionaryBase
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{
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virtual bool hasHierarchy() const = 0;
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virtual void toParent(const PODArray<id_t> & ids, PODArray<id_t> & out) const = 0;
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virtual void has(const PODArray<id_t> & ids, PODArray<UInt8> & out) const = 0;
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/// do not call unless you ensure that hasHierarchy() returns true
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id_t toParent(id_t id) const
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{
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const PODArray<UInt64> ids(1, id);
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PODArray<UInt64> out(1);
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toParent(ids, out);
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return out.front();
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}
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bool in(id_t child_id, const id_t ancestor_id) const
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{
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while (child_id != 0 && child_id != ancestor_id)
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child_id = toParent(child_id);
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return child_id != 0;
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}
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};
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}
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