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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#pragma once
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#include <optional>
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#include <Parsers/ASTWithAlias.h>
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namespace DB
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{
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struct IdentifierSemantic;
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struct IdentifierSemanticImpl;
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struct DatabaseAndTableWithAlias;
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/// Identifier (column, table or alias)
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class ASTIdentifier : public ASTWithAlias
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{
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public:
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/// The composite identifier will have a concatenated name (of the form a.b.c),
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/// and individual components will be available inside the name_parts.
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String name;
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ASTIdentifier(const String & name_, std::vector<String> && name_parts_ = {});
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ASTIdentifier(std::vector<String> && name_parts_);
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/** Get the text that identifies this element. */
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String getID(char delim) const override { return "Identifier" + (delim + name); }
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ASTPtr clone() const override;
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void collectIdentifierNames(IdentifierNameSet & set) const override
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{
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set.insert(name);
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}
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bool compound() const { return !name_parts.empty(); }
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bool isShort() const { return name_parts.empty() || name == name_parts.back(); }
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void setShortName(const String & new_name);
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const String & shortName() const
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{
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if (!name_parts.empty())
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return name_parts.back();
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return name;
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}
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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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private:
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using ASTWithAlias::children; /// ASTIdentifier is child free
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std::vector<String> name_parts;
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std::shared_ptr<IdentifierSemanticImpl> semantic; /// pimpl
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static std::shared_ptr<ASTIdentifier> createSpecial(const String & name, std::vector<String> && name_parts = {});
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friend struct IdentifierSemantic;
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friend ASTPtr createTableIdentifier(const String & database_name, const String & table_name);
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friend void setIdentifierSpecial(ASTPtr & ast);
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};
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/// ASTIdentifier Helpers: hide casts and semantic.
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ASTPtr createTableIdentifier(const String & database_name, const String & table_name);
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void setIdentifierSpecial(ASTPtr & ast);
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std::optional<String> getIdentifierName(const IAST * const ast);
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inline std::optional<String> getIdentifierName(const ASTPtr & ast) { return getIdentifierName(ast.get()); }
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bool getIdentifierName(const ASTPtr & ast, String & name);
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}
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