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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
#pragma once
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#include <Interpreters/IInterpreter.h>
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#include <Parsers/ASTRenameQuery.h>
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namespace DB
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{
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class AccessRightsElements;
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class DDLGuard;
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/// To avoid deadlocks, we must acquire locks for tables in same order in any different RENAMES.
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struct UniqueTableName
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{
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String database_name;
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String table_name;
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UniqueTableName(const String & database_name_, const String & table_name_)
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: database_name(database_name_), table_name(table_name_) {}
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bool operator< (const UniqueTableName & rhs) const
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{
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return std::tie(database_name, table_name) < std::tie(rhs.database_name, rhs.table_name);
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}
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};
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struct RenameDescription
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{
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RenameDescription(const ASTRenameQuery::Element & elem, const String & current_database) :
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from_database_name(elem.from.database.empty() ? current_database : elem.from.database),
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from_table_name(elem.from.table),
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to_database_name(elem.to.database.empty() ? current_database : elem.to.database),
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to_table_name(elem.to.table),
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if_exists(elem.if_exists)
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{}
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String from_database_name;
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String from_table_name;
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String to_database_name;
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String to_table_name;
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bool if_exists;
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};
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using RenameDescriptions = std::vector<RenameDescription>;
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using TableGuards = std::map<UniqueTableName, std::unique_ptr<DDLGuard>>;
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/** Rename one table
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* or rename many tables at once.
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*/
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class InterpreterRenameQuery : public IInterpreter, WithContext
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{
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public:
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InterpreterRenameQuery(const ASTPtr & query_ptr_, ContextPtr context_);
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BlockIO execute() override;
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void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const override;
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bool renamedInsteadOfExchange() const { return renamed_instead_of_exchange; }
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private:
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BlockIO executeToTables(const ASTRenameQuery & rename, const RenameDescriptions & descriptions, TableGuards & ddl_guards);
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BlockIO executeToDatabase(const ASTRenameQuery & rename, const RenameDescriptions & descriptions);
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AccessRightsElements getRequiredAccess() const;
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ASTPtr query_ptr;
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bool renamed_instead_of_exchange{false};
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};
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}
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