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108 lines
4.6 KiB
C++
108 lines
4.6 KiB
C++
#pragma once
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#include <DataTypes/DataTypeWithSimpleSerialization.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 DataTypeWithSimpleSerialization
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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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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);
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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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void serializeBinary(const Field & field, WriteBuffer & ostr) const override;
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void deserializeBinary(Field & field, ReadBuffer & istr) const override;
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void serializeBinary(const IColumn & column, size_t row_num, WriteBuffer & ostr) const override;
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void deserializeBinary(IColumn & column, ReadBuffer & istr) const override;
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void serializeText(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const override;
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void deserializeText(IColumn & column, ReadBuffer & istr, const FormatSettings &) const override;
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void serializeTextJSON(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const override;
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void deserializeTextJSON(IColumn & column, ReadBuffer & istr, const FormatSettings &) const override;
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void serializeTextXML(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const override;
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/// Tuples in CSV format will be serialized as separate columns (that is, losing their nesting in the tuple).
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void serializeTextCSV(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const override;
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void deserializeTextCSV(IColumn & column, ReadBuffer & istr, const FormatSettings &) const override;
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/** Each sub-column in a tuple is serialized in separate stream.
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*/
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void enumerateStreams(const StreamCallback & callback, SubstreamPath & path) const override;
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void serializeBinaryBulkStatePrefix(
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SerializeBinaryBulkSettings & settings,
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SerializeBinaryBulkStatePtr & state) const override;
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void serializeBinaryBulkStateSuffix(
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SerializeBinaryBulkSettings & settings,
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SerializeBinaryBulkStatePtr & state) const override;
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void deserializeBinaryBulkStatePrefix(
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DeserializeBinaryBulkSettings & settings,
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DeserializeBinaryBulkStatePtr & state) const override;
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void serializeBinaryBulkWithMultipleStreams(
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const IColumn & column,
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size_t offset,
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size_t limit,
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SerializeBinaryBulkSettings & settings,
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SerializeBinaryBulkStatePtr & state) const override;
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void deserializeBinaryBulkWithMultipleStreams(
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IColumn & column,
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size_t limit,
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DeserializeBinaryBulkSettings & settings,
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DeserializeBinaryBulkStatePtr & state) const override;
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void serializeProtobuf(const IColumn & column, size_t row_num, ProtobufWriter & protobuf, size_t & value_index) const override;
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void deserializeProtobuf(IColumn & column, ProtobufReader & protobuf, bool allow_add_row, bool & row_added) const override;
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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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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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};
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}
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