#include #include #include #include #include #include #include #include #include #include #include #include #include namespace DB { namespace ErrorCodes { extern const int LOGICAL_ERROR; extern const int SYNTAX_ERROR; extern const int UNKNOWN_TABLE; extern const int UNKNOWN_DICTIONARY; } static DatabasePtr tryGetDatabase(const String & database_name, bool if_exists) { return if_exists ? DatabaseCatalog::instance().tryGetDatabase(database_name) : DatabaseCatalog::instance().getDatabase(database_name); } InterpreterDropQuery::InterpreterDropQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {} BlockIO InterpreterDropQuery::execute() { auto & drop = query_ptr->as(); if (!drop.cluster.empty()) return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster()); if (!drop.table.empty()) { if (!drop.is_dictionary) return executeToTable({drop.database, drop.table, drop.uuid}, drop); else return executeToDictionary(drop.database, drop.table, drop.kind, drop.if_exists, drop.temporary, drop.no_ddl_lock); } else if (!drop.database.empty()) return executeToDatabase(drop.database, drop.kind, drop.if_exists); else throw Exception("Nothing to drop, both names are empty", ErrorCodes::LOGICAL_ERROR); } BlockIO InterpreterDropQuery::executeToTable( const StorageID & table_id_, const ASTDropQuery & query) { if (query.temporary || table_id_.database_name.empty()) { if (context.tryResolveStorageID(table_id_, Context::ResolveExternal)) return executeToTemporaryTable(table_id_.getTableName(), query.kind); } if (query.temporary) { if (query.if_exists) return {}; throw Exception("Temporary table " + backQuoteIfNeed(table_id_.table_name) + " doesn't exist", ErrorCodes::UNKNOWN_TABLE); } auto table_id = context.resolveStorageID(table_id_, Context::ResolveOrdinary); std::unique_ptr ddl_guard; if (auto db = DatabaseCatalog::instance().tryGetDatabase(table_id.database_name)) //FIXME if (db->getEngineName() != "Atomic") ddl_guard = (!query.no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(table_id.database_name, table_id.table_name) : nullptr); auto [database, table] = tryGetDatabaseAndTable(table_id.database_name, table_id.table_name, query.if_exists); if (database && table) { if (query_ptr->as().is_view && !table->isView()) throw Exception("Table " + table_id.getNameForLogs() + " is not a View", ErrorCodes::LOGICAL_ERROR); table_id = table->getStorageID(); if (query.kind == ASTDropQuery::Kind::Detach) { context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id); table->shutdown(); /// If table was already dropped by anyone, an exception will be thrown auto table_lock = table->lockExclusively(context.getCurrentQueryId()); /// Drop table from memory, don't touch data and metadata database->detachTable(table_id.table_name); } else if (query.kind == ASTDropQuery::Kind::Truncate) { context.checkAccess(table->isView() ? AccessType::TRUNCATE_VIEW : AccessType::TRUNCATE_TABLE, table_id); table->checkTableCanBeDropped(); /// If table was already dropped by anyone, an exception will be thrown auto table_lock = table->lockExclusively(context.getCurrentQueryId()); /// Drop table data, don't touch metadata table->truncate(query_ptr, context, table_lock); } else if (query.kind == ASTDropQuery::Kind::Drop) { context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id); table->checkTableCanBeDropped(); table->shutdown(); /// If table was already dropped by anyone, an exception will be thrown TableStructureWriteLockHolder table_lock; if (database->getEngineName() != "Atomic") table_lock = table->lockExclusively(context.getCurrentQueryId()); database->dropTable(context, table_id.table_name, query.no_delay); } } return {}; } BlockIO InterpreterDropQuery::executeToDictionary( const String & database_name_, const String & dictionary_name, ASTDropQuery::Kind kind, bool if_exists, bool is_temporary, bool no_ddl_lock) { if (is_temporary) throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR); String database_name = context.resolveDatabase(database_name_); auto ddl_guard = (!no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(database_name, dictionary_name) : nullptr); DatabasePtr database = tryGetDatabase(database_name, if_exists); if (!database || !database->isDictionaryExist(context, dictionary_name)) { if (!if_exists) throw Exception( "Dictionary " + backQuoteIfNeed(database_name) + "." + backQuoteIfNeed(dictionary_name) + " doesn't exist.", ErrorCodes::UNKNOWN_DICTIONARY); else return {}; } if (kind == ASTDropQuery::Kind::Detach) { /// Drop dictionary from memory, don't touch data and metadata context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name); database->detachDictionary(dictionary_name, context); } else if (kind == ASTDropQuery::Kind::Truncate) { throw Exception("Cannot TRUNCATE dictionary", ErrorCodes::SYNTAX_ERROR); } else if (kind == ASTDropQuery::Kind::Drop) { context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name); database->removeDictionary(context, dictionary_name); } return {}; } BlockIO InterpreterDropQuery::executeToTemporaryTable(const String & table_name, ASTDropQuery::Kind kind) { if (kind == ASTDropQuery::Kind::Detach) throw Exception("Unable to detach temporary table.", ErrorCodes::SYNTAX_ERROR); else { auto & context_handle = context.hasSessionContext() ? context.getSessionContext() : context; auto resolved_id = context_handle.tryResolveStorageID(StorageID("", table_name), Context::ResolveExternal); if (resolved_id) { StoragePtr table = DatabaseCatalog::instance().getTable(resolved_id); if (kind == ASTDropQuery::Kind::Truncate) { /// If table was already dropped by anyone, an exception will be thrown auto table_lock = table->lockExclusively(context.getCurrentQueryId()); /// Drop table data, don't touch metadata table->truncate(query_ptr, context, table_lock); } else if (kind == ASTDropQuery::Kind::Drop) { context_handle.removeExternalTable(table_name); table->shutdown(); /// If table was already dropped by anyone, an exception will be thrown auto table_lock = table->lockExclusively(context.getCurrentQueryId()); /// Delete table data table->drop(); table->is_dropped = true; } } } return {}; } BlockIO InterpreterDropQuery::executeToDatabase(const String & database_name, ASTDropQuery::Kind kind, bool if_exists) { auto ddl_guard = DatabaseCatalog::instance().getDDLGuard(database_name, ""); if (auto database = tryGetDatabase(database_name, if_exists)) { if (kind == ASTDropQuery::Kind::Truncate) { throw Exception("Unable to truncate database", ErrorCodes::SYNTAX_ERROR); } else if (kind == ASTDropQuery::Kind::Detach || kind == ASTDropQuery::Kind::Drop) { bool drop = kind == ASTDropQuery::Kind::Drop; context.checkAccess(AccessType::DROP_DATABASE, database_name); /// DETACH or DROP all tables and dictionaries inside database ASTDropQuery query; query.kind = kind; query.database = database_name; for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next()) { query.table = iterator->name(); executeToTable({query.database, query.table}, query); } for (auto iterator = database->getDictionariesIterator(context); iterator->isValid(); iterator->next()) { String current_dictionary = iterator->name(); executeToDictionary(database_name, current_dictionary, kind, false, false, false); } /// DETACH or DROP database itself DatabaseCatalog::instance().detachDatabase(database_name, drop); } } return {}; } DatabaseAndTable InterpreterDropQuery::tryGetDatabaseAndTable(const String & database_name, const String & table_name, bool if_exists) { DatabasePtr database = tryGetDatabase(database_name, if_exists); if (database) { StoragePtr table = database->tryGetTable(context, table_name); if (!table && !if_exists) throw Exception("Table " + backQuoteIfNeed(database_name) + "." + backQuoteIfNeed(table_name) + " doesn't exist", ErrorCodes::UNKNOWN_TABLE); return {std::move(database), std::move(table)}; } return {}; } AccessRightsElements InterpreterDropQuery::getRequiredAccessForDDLOnCluster() const { AccessRightsElements required_access; const auto & drop = query_ptr->as(); if (drop.table.empty()) { if (drop.kind == ASTDropQuery::Kind::Detach) required_access.emplace_back(AccessType::DROP_DATABASE, drop.database); else if (drop.kind == ASTDropQuery::Kind::Drop) required_access.emplace_back(AccessType::DROP_DATABASE, drop.database); } else if (drop.is_dictionary) { if (drop.kind == ASTDropQuery::Kind::Detach) required_access.emplace_back(AccessType::DROP_DICTIONARY, drop.database, drop.table); else if (drop.kind == ASTDropQuery::Kind::Drop) required_access.emplace_back(AccessType::DROP_DICTIONARY, drop.database, drop.table); } else if (!drop.temporary) { /// It can be view or table. if (drop.kind == ASTDropQuery::Kind::Drop) required_access.emplace_back(AccessType::DROP_TABLE | AccessType::DROP_VIEW, drop.database, drop.table); else if (drop.kind == ASTDropQuery::Kind::Truncate) required_access.emplace_back(AccessType::TRUNCATE_TABLE | AccessType::TRUNCATE_VIEW, drop.database, drop.table); else if (drop.kind == ASTDropQuery::Kind::Detach) required_access.emplace_back(AccessType::DROP_TABLE | AccessType::DROP_VIEW, drop.database, drop.table); } return required_access; } }