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