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38 lines
955 B
C++
38 lines
955 B
C++
#pragma once
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#include <DB/Core/Field.h>
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#include <DB/DataTypes/IDataType.h>
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#include <DB/Parsers/ASTWithAlias.h>
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namespace DB
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{
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/** Литерал (атомарный) - число, строка, NULL
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*/
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class ASTLiteral : public ASTWithAlias
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{
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public:
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Field value;
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/// тип
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DataTypePtr type;
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ASTLiteral() = default;
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ASTLiteral(const StringRange range_, const Field & value_) : ASTWithAlias(range_), value(value_) {}
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String getColumnName() const override;
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/** Получить текст, который идентифицирует этот элемент. */
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String getID() const override { return "Literal_" + apply_visitor(FieldVisitorDump(), value); }
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ASTPtr clone() const override { return new ASTLiteral(*this); }
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protected:
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void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
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{
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settings.ostr << apply_visitor(FieldVisitorToString(), value);
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}
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};
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}
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