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53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
#pragma once
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#include <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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bool with_fill;
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ASTPtr fill_from;
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ASTPtr fill_to;
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ASTPtr fill_step;
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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(
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const int direction_, const int nulls_direction_, const bool nulls_direction_was_explicitly_specified_,
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ASTPtr & collation_, const bool with_fill_, ASTPtr & fill_from_, ASTPtr & fill_to_, ASTPtr & fill_step_)
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: direction(direction_)
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, 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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, with_fill(with_fill_)
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, fill_from(fill_from_)
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, fill_to(fill_to_)
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, fill_step(fill_step_)
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{
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}
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String getID(char) const override { return "OrderByElement"; }
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ASTPtr clone() const override
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{
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auto clone = std::make_shared<ASTOrderByElement>(*this);
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clone->cloneChildren();
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return clone;
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}
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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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