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46 lines
1.1 KiB
C++
46 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 a AS (SELECT 1) SELECT * FROM a AS b; cte_name will be `a`.
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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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auto clone = std::make_shared<ASTSubquery>(*this);
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clone->cloneChildren();
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return clone;
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}
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ASTSubquery() = default;
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explicit ASTSubquery(ASTPtr child)
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{
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children.emplace_back(std::move(child));
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}
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void updateTreeHashImpl(SipHash & hash_state, bool ignore_aliases) 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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