ClickHouse/dbms/include/DB/Parsers/ASTLiteral.h

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#pragma once
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#include <DB/Core/Field.h>
#include <DB/Core/FieldVisitors.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
{
/** Литерал (атомарный) - число, строка, NULL
*/
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class ASTLiteral : public ASTWithAlias
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{
public:
Field value;
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ASTLiteral() = default;
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); }
protected:
void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
{
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settings.ostr << apply_visitor(FieldVisitorToString(), value);
}
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};
}