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https://github.com/ClickHouse/ClickHouse.git
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107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
#pragma once
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#include <DB/DataTypes/DataTypeFactory.h>
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#include <DB/IO/ReadBufferFromString.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/WriteHelpers.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <ext/range.hpp>
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#include <numeric>
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#include <vector>
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#include <string>
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#include <map>
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#include <experimental/optional>
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namespace DB
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{
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enum class AttributeUnderlyingType
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{
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UInt8,
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UInt16,
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UInt32,
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UInt64,
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Int8,
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Int16,
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Int32,
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Int64,
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Float32,
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Float64,
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String
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};
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/** Для неявных преобразований в функциях dictGet.
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*/
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bool isAttributeTypeConvertibleTo(AttributeUnderlyingType from, AttributeUnderlyingType to);
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AttributeUnderlyingType getAttributeUnderlyingType(const std::string & type);
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std::string toString(const AttributeUnderlyingType type);
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/// Min and max lifetimes for a dictionary or it's entry
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struct DictionaryLifetime final
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{
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std::uint64_t min_sec;
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std::uint64_t max_sec;
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DictionaryLifetime(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
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};
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/** Holds the description of a single dictionary attribute:
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* - name, used for lookup into dictionary and source;
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* - type, used in conjunction with DataTypeFactory and getAttributeUnderlyingTypeByname;
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* - null_value, used as a default value for non-existent entries in the dictionary,
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* decimal representation for numeric attributes;
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* - hierarchical, whether this attribute defines a hierarchy;
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* - injective, whether the mapping to parent is injective (can be used for optimization of GROUP BY?)
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*/
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struct DictionaryAttribute final
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{
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const std::string name;
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const AttributeUnderlyingType underlying_type;
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const DataTypePtr type;
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const std::string expression;
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const Field null_value;
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const bool hierarchical;
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const bool injective;
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};
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struct DictionarySpecialAttribute final
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{
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const std::string name;
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const std::string expression;
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DictionarySpecialAttribute(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
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};
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/// Name of identifier plus list of attributes
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struct DictionaryStructure final
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{
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std::experimental::optional<DictionarySpecialAttribute> id;
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std::experimental::optional<std::vector<DictionaryAttribute>> key;
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std::vector<DictionaryAttribute> attributes;
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std::experimental::optional<DictionarySpecialAttribute> range_min;
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std::experimental::optional<DictionarySpecialAttribute> range_max;
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bool has_expressions = false;
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DictionaryStructure(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
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void validateKeyTypes(const DataTypes & key_types) const;
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std::string getKeyDescription() const;
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bool isKeySizeFixed() const;
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std::size_t getKeySize() const;
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private:
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std::vector<DictionaryAttribute> getAttributes(
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const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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const bool hierarchy_allowed = true, const bool allow_null_values = true);
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};
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}
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