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81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
#pragma once
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#include <DataTypes/IDataType.h>
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namespace DB
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{
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/** Tuple data type.
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* Used as an intermediate result when evaluating expressions.
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* Also can be used as a column - the result of the query execution.
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*
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* Tuple elements can have names.
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* If an element is unnamed, it will have automatically assigned name like '1', '2', '3' corresponding to its position.
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* Manually assigned names must not begin with digit. Names must be unique.
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*
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* All tuples with same size and types of elements are equivalent for expressions, regardless to names of elements.
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*/
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class DataTypeTuple final : public IDataType
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{
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private:
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DataTypes elems;
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Strings names;
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bool have_explicit_names;
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bool serialize_names = true;
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public:
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static constexpr bool is_parametric = true;
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DataTypeTuple(const DataTypes & elems);
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DataTypeTuple(const DataTypes & elems, const Strings & names, bool serialize_names_ = true);
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static bool canBeCreatedWithNames(const Strings & names);
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TypeIndex getTypeId() const override { return TypeIndex::Tuple; }
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std::string doGetName() const override;
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const char * getFamilyName() const override { return "Tuple"; }
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bool canBeInsideNullable() const override { return false; }
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MutableColumnPtr createColumn() const override;
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Field getDefault() const override;
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void insertDefaultInto(IColumn & column) 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 !elems.empty(); }
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bool isComparable() const override;
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bool textCanContainOnlyValidUTF8() const override;
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bool haveMaximumSizeOfValue() const override;
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size_t getMaximumSizeOfValueInMemory() const override;
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size_t getSizeOfValueInMemory() const override;
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DataTypePtr tryGetSubcolumnType(const String & subcolumn_name) const override;
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ColumnPtr getSubcolumn(const String & subcolumn_name, const IColumn & column) const override;
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SerializationPtr getSerialization(const String & column_name, const StreamExistenceCallback & callback) const override;
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SerializationPtr getSubcolumnSerialization(
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const String & subcolumn_name, const BaseSerializationGetter & base_serialization_getter) const override;
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SerializationPtr doGetDefaultSerialization() const override;
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const DataTypes & getElements() const { return elems; }
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const Strings & getElementNames() const { return names; }
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size_t getPositionByName(const String & name) const;
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bool haveExplicitNames() const { return have_explicit_names; }
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bool serializeNames() const { return serialize_names; }
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private:
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template <typename OnSuccess, typename OnContinue>
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auto getSubcolumnEntity(const String & subcolumn_name,
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const OnSuccess & on_success, const OnContinue & on_continue) const;
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};
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}
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