ClickHouse/dbms/Interpreters/InterpreterRenameQuery.h

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#pragma once
#include <Interpreters/IInterpreter.h>
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#include <Parsers/IAST_fwd.h>
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namespace DB
{
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class Context;
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class AccessRightsElements;
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/// To avoid deadlocks, we must acquire locks for tables in same order in any different RENAMES.
struct UniqueTableName
{
String database_name;
String table_name;
UniqueTableName(const String & database_name_, const String & table_name_)
: database_name(database_name_), table_name(table_name_) {}
bool operator< (const UniqueTableName & rhs) const
{
return std::tie(database_name, table_name) < std::tie(rhs.database_name, rhs.table_name);
}
};
using TableGuards = std::map<UniqueTableName, std::unique_ptr<DDLGuard>>;
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/** Rename one table
* or rename many tables at once.
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*/
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class InterpreterRenameQuery : public IInterpreter
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{
public:
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InterpreterRenameQuery(const ASTPtr & query_ptr_, Context & context_);
BlockIO execute() override;
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private:
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AccessRightsElements getRequiredAccess() const;
ASTPtr query_ptr;
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Context & context;
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};
}