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https://github.com/ClickHouse/ClickHouse.git
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90 lines
4.2 KiB
C++
90 lines
4.2 KiB
C++
#pragma once
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#include <DataTypes/IDataType.h>
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#include <Columns/IColumnUnique.h>
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namespace DB
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{
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class DataTypeLowCardinality : public IDataType
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{
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private:
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DataTypePtr dictionary_type;
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public:
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DataTypeLowCardinality(DataTypePtr dictionary_type_);
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const DataTypePtr & getDictionaryType() const { return dictionary_type; }
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String doGetName() const override
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{
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return "LowCardinality(" + dictionary_type->getName() + ")";
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}
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const char * getFamilyName() const override { return "LowCardinality"; }
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TypeIndex getTypeId() const override { return TypeIndex::LowCardinality; }
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MutableColumnPtr createColumn() const override;
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Field getDefault() const override;
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bool equals(const IDataType & rhs) const override;
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bool isParametric() const override { return true; }
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bool haveSubtypes() const override { return true; }
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bool cannotBeStoredInTables() const override { return dictionary_type->cannotBeStoredInTables(); }
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bool shouldAlignRightInPrettyFormats() const override { return dictionary_type->shouldAlignRightInPrettyFormats(); }
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bool textCanContainOnlyValidUTF8() const override { return dictionary_type->textCanContainOnlyValidUTF8(); }
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bool isComparable() const override { return dictionary_type->isComparable(); }
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bool canBeComparedWithCollation() const override { return dictionary_type->canBeComparedWithCollation(); }
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bool canBeUsedAsVersion() const override { return dictionary_type->canBeUsedAsVersion(); }
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bool isSummable() const override { return dictionary_type->isSummable(); }
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bool canBeUsedInBitOperations() const override { return dictionary_type->canBeUsedInBitOperations(); }
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bool canBeUsedInBooleanContext() const override { return dictionary_type->canBeUsedInBooleanContext(); }
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bool isValueRepresentedByNumber() const override { return dictionary_type->isValueRepresentedByNumber(); }
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bool isValueRepresentedByInteger() const override { return dictionary_type->isValueRepresentedByInteger(); }
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bool isValueUnambiguouslyRepresentedInContiguousMemoryRegion() const override { return true; }
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bool haveMaximumSizeOfValue() const override { return dictionary_type->haveMaximumSizeOfValue(); }
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size_t getMaximumSizeOfValueInMemory() const override { return dictionary_type->getMaximumSizeOfValueInMemory(); }
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size_t getSizeOfValueInMemory() const override { return dictionary_type->getSizeOfValueInMemory(); }
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bool isCategorial() const override { return false; }
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bool isNullable() const override { return false; }
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bool onlyNull() const override { return false; }
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bool lowCardinality() const override { return true; }
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static MutableColumnUniquePtr createColumnUnique(const IDataType & keys_type);
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static MutableColumnUniquePtr createColumnUnique(const IDataType & keys_type, MutableColumnPtr && keys);
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private:
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SerializationPtr doGetDefaultSerialization() const override;
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template <typename ... Params>
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using SerializeFunctionPtr = void (IDataType::*)(const IColumn &, size_t, Params ...) const;
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template <typename... Params, typename... Args>
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void serializeImpl(const IColumn & column, size_t row_num, SerializeFunctionPtr<Params...> func, Args &&... args) const;
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template <typename ... Params>
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using DeserializeFunctionPtr = void (IDataType::*)(IColumn &, Params ...) const;
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template <typename ... Params, typename... Args>
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void deserializeImpl(IColumn & column, DeserializeFunctionPtr<Params...> func, Args &&... args) const;
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template <typename Creator>
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static MutableColumnUniquePtr createColumnUniqueImpl(const IDataType & keys_type, const Creator & creator);
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};
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/// Returns dictionary type if type is DataTypeLowCardinality, type otherwise.
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DataTypePtr removeLowCardinality(const DataTypePtr & type);
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/// Remove LowCardinality recursively from all nested types.
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DataTypePtr recursiveRemoveLowCardinality(const DataTypePtr & type);
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/// Remove LowCardinality recursively from all nested columns.
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ColumnPtr recursiveRemoveLowCardinality(const ColumnPtr & column);
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/// Convert column of type from_type to type to_type by converting nested LowCardinality columns.
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ColumnPtr recursiveTypeConversion(const ColumnPtr & column, const DataTypePtr & from_type, const DataTypePtr & to_type);
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}
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