mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-12 02:23:14 +00:00
37 lines
973 B
C++
37 lines
973 B
C++
#pragma once
|
|
|
|
#include <DB/Core/Field.h>
|
|
#include <DB/Core/FieldVisitors.h>
|
|
#include <DB/DataTypes/IDataType.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_" + apply_visitor(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 << apply_visitor(FieldVisitorToString(), value);
|
|
}
|
|
};
|
|
|
|
}
|