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

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