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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
#pragma once
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#include <DB/Parsers/IAST.h>
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namespace DB
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{
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/** Element of expression with ASC or DESC,
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* and possibly with COLLATE.
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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 for ASC, -1 for DESC
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int nulls_direction; /// Same as direction for NULLS LAST, opposite for NULLS FIRST.
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bool nulls_direction_was_explicitly_specified;
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/** Collation for locale-specific string comparison. If empty, then sorting done by bytes. */
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ASTPtr collation;
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ASTOrderByElement() = default;
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ASTOrderByElement(const StringRange range_,
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const int direction_, const int nulls_direction_, const bool nulls_direction_was_explicitly_specified_,
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ASTPtr & collation_)
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: IAST(range_),
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direction(direction_), nulls_direction(nulls_direction_),
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nulls_direction_was_explicitly_specified(nulls_direction_was_explicitly_specified_),
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collation(collation_) {}
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String getID() const override { return "OrderByElement"; }
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ASTPtr clone() const override { return std::make_shared<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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}
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