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45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#pragma once
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#include <Parsers/ASTWithAlias.h>
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namespace DB
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{
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/** SELECT subquery
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*/
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class ASTSubquery : public ASTWithAlias
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{
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public:
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// Stored the name when the subquery is defined in WITH clause. For example:
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// WITH (SELECT 1) AS a SELECT * FROM a AS b; cte_name will be `a`.
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std::string cte_name;
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/** Get the text that identifies this element. */
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String getID(char) const override { return "Subquery"; }
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ASTPtr clone() const override
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{
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const auto res = std::make_shared<ASTSubquery>(*this);
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ASTPtr ptr{res};
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res->children.clear();
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for (const auto & child : children)
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res->children.emplace_back(child->clone());
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return ptr;
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}
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void updateTreeHashImpl(SipHash & hash_state) const override;
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String getAliasOrColumnName() const override;
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String tryGetAlias() const override;
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protected:
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void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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void appendColumnNameImpl(WriteBuffer & ostr) const override;
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};
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}
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