mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-23 16:12:01 +00:00
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
#pragma once
|
|
|
|
#include <DB/Parsers/IAST.h>
|
|
#include <DB/Common/Collator.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
using Poco::SharedPtr;
|
|
|
|
|
|
/** Элемент выражения, после которого стоит ASC или DESC
|
|
*/
|
|
class ASTOrderByElement : public IAST
|
|
{
|
|
public:
|
|
int direction; /// 1, если ASC, -1, если DESC
|
|
|
|
/** Collator для locale-specific сортировки строк.
|
|
* Если nullptr, то производится сортировка по байтам.
|
|
*/
|
|
Poco::SharedPtr<Collator> collator;
|
|
|
|
ASTOrderByElement() = default;
|
|
ASTOrderByElement(const StringRange range_, const int direction_, const Poco::SharedPtr<Collator> & collator_ = nullptr)
|
|
: IAST(range_), direction(direction_), collator(collator_) {}
|
|
|
|
/** Получить текст, который идентифицирует этот элемент. */
|
|
String getID() const override { return "OrderByElement"; }
|
|
|
|
ASTPtr clone() const override { return new ASTOrderByElement(*this); }
|
|
|
|
protected:
|
|
void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
|
|
{
|
|
children.front()->formatImpl(settings, state, frame);
|
|
settings.ostr << (settings.hilite ? hilite_keyword : "") << (direction == -1 ? " DESC" : " ASC") << (settings.hilite ? hilite_none : "");
|
|
if (!collator.isNull())
|
|
{
|
|
settings.ostr << (settings.hilite ? hilite_keyword : "") << " COLLATE " << (settings.hilite ? hilite_none : "")
|
|
<< "'" << collator->getLocale() << "'";
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|