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

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