2011-09-04 05:14:52 +00:00
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#pragma once
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2017-04-01 09:19:00 +00:00
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#include <Parsers/IAST.h>
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2016-11-20 12:43:20 +00:00
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2011-09-04 05:14:52 +00:00
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namespace DB
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{
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2017-01-06 13:36:08 +00:00
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/** Element of expression with ASC or DESC,
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* and possibly with COLLATE.
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2011-09-04 05:14:52 +00:00
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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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2017-04-01 07:20:54 +00:00
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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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2016-05-28 14:14:18 +00:00
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2017-04-01 07:20:54 +00:00
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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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2016-05-28 14:14:18 +00:00
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2018-02-26 03:37:08 +00:00
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ASTOrderByElement(
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const int direction_,
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const int nulls_direction_,
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const bool nulls_direction_was_explicitly_specified_,
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2017-04-01 07:20:54 +00:00
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ASTPtr & collation_)
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2018-02-26 03:37:08 +00:00
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:
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2017-04-01 07:20:54 +00:00
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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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2016-05-28 14:14:18 +00:00
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2017-04-01 07:20:54 +00:00
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String getID() const override { return "OrderByElement"; }
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2011-12-12 06:15:34 +00:00
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2018-05-17 13:33:28 +00:00
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ASTPtr clone() const override {
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auto clone = std::make_shared<ASTOrderByElement>(*this);
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clone->cloneChildren();
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return std::move(clone);
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}
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2015-08-05 21:38:31 +00:00
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protected:
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2017-04-01 07:20:54 +00:00
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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2011-09-04 05:14:52 +00:00
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};
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}
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