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121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
#include <Parsers/ASTRenameQuery.h>
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#include <Databases/IDatabase.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/InterpreterRenameQuery.h>
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#include <Storages/IStorage.h>
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#include <Interpreters/DDLWorker.h>
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#include <Access/AccessRightsElement.h>
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namespace DB
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{
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InterpreterRenameQuery::InterpreterRenameQuery(const ASTPtr & query_ptr_, Context & context_)
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: query_ptr(query_ptr_), context(context_)
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{
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}
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BlockIO InterpreterRenameQuery::execute()
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{
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const auto & rename = query_ptr->as<const ASTRenameQuery &>();
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if (!rename.cluster.empty())
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return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
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context.checkAccess(getRequiredAccess());
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String path = context.getPath();
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String current_database = context.getCurrentDatabase();
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/** In case of error while renaming, it is possible that only part of tables was renamed
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* or we will be in inconsistent state. (It is worth to be fixed.)
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*/
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RenameDescriptions descriptions;
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descriptions.reserve(rename.elements.size());
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/// Don't allow to drop tables (that we are renaming); don't allow to create tables in places where tables will be renamed.
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TableGuards table_guards;
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for (const auto & elem : rename.elements)
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{
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descriptions.emplace_back(elem, current_database);
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const auto & description = descriptions.back();
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UniqueTableName from(description.from_database_name, description.from_table_name);
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UniqueTableName to(description.to_database_name, description.to_table_name);
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table_guards[from];
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table_guards[to];
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}
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auto & database_catalog = DatabaseCatalog::instance();
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/// Must do it in consistent order.
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for (auto & table_guard : table_guards)
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table_guard.second = database_catalog.getDDLGuard(table_guard.first.database_name, table_guard.first.table_name);
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if (rename.database)
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return executeToDatabase(rename, descriptions);
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else
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return executeToTables(rename, descriptions);
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}
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BlockIO InterpreterRenameQuery::executeToTables(const ASTRenameQuery & rename, const RenameDescriptions & descriptions)
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{
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auto & database_catalog = DatabaseCatalog::instance();
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for (const auto & elem : descriptions)
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{
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if (!rename.exchange)
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database_catalog.assertTableDoesntExist(StorageID(elem.to_database_name, elem.to_table_name), context);
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database_catalog.getDatabase(elem.from_database_name)->renameTable(
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context,
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elem.from_table_name,
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*database_catalog.getDatabase(elem.to_database_name),
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elem.to_table_name,
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rename.exchange,
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rename.dictionary);
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}
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return {};
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}
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BlockIO InterpreterRenameQuery::executeToDatabase(const ASTRenameQuery &, const RenameDescriptions & descriptions)
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{
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assert(descriptions.size() == 1);
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assert(descriptions.front().from_table_name.empty());
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assert(descriptions.front().to_table_name.empty());
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const auto & old_name = descriptions.front().from_database_name;
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const auto & new_name = descriptions.back().to_database_name;
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auto & catalog = DatabaseCatalog::instance();
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auto db = catalog.getDatabase(old_name);
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catalog.assertDatabaseDoesntExist(new_name);
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db->renameDatabase(new_name);
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return {};
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}
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AccessRightsElements InterpreterRenameQuery::getRequiredAccess() const
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{
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AccessRightsElements required_access;
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const auto & rename = query_ptr->as<const ASTRenameQuery &>();
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for (const auto & elem : rename.elements)
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{
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required_access.emplace_back(AccessType::SELECT | AccessType::DROP_TABLE, elem.from.database, elem.from.table);
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required_access.emplace_back(AccessType::CREATE_TABLE | AccessType::INSERT, elem.to.database, elem.to.table);
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if (rename.exchange)
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{
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required_access.emplace_back(AccessType::CREATE_TABLE | AccessType::INSERT, elem.from.database, elem.from.table);
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required_access.emplace_back(AccessType::SELECT | AccessType::DROP_TABLE, elem.to.database, elem.to.table);
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}
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}
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return required_access;
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}
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}
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