#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace DB { namespace ErrorCodes { extern const int NOT_IMPLEMENTED; extern const int INCORRECT_QUERY; extern const int QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW; } static inline String generateInnerTableName(const StorageID & view_id) { if (view_id.hasUUID()) return ".inner_id." + toString(view_id.uuid); return ".inner." + view_id.getTableName(); } StorageMaterializedView::StorageMaterializedView( const StorageID & table_id_, Context & local_context, const ASTCreateQuery & query, const ColumnsDescription & columns_, bool attach_) : IStorage(table_id_), global_context(local_context.getGlobalContext()) { StorageInMemoryMetadata storage_metadata; storage_metadata.setColumns(columns_); if (!query.select) throw Exception("SELECT query is not specified for " + getName(), ErrorCodes::INCORRECT_QUERY); /// If the destination table is not set, use inner table has_inner_table = query.to_table_id.empty(); if (has_inner_table && !query.storage) throw Exception( "You must specify where to save results of a MaterializedView query: either ENGINE or an existing table in a TO clause", ErrorCodes::INCORRECT_QUERY); if (query.select->list_of_selects->children.size() != 1) throw Exception("UNION is not supported for MATERIALIZED VIEW", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW); auto select = SelectQueryDescription::getSelectQueryFromASTForMatView(query.select->clone(), local_context); storage_metadata.setSelectQuery(select); setInMemoryMetadata(storage_metadata); if (!has_inner_table) target_table_id = query.to_table_id; else if (attach_) { /// If there is an ATTACH request, then the internal table must already be created. target_table_id = StorageID(getStorageID().database_name, generateInnerTableName(getStorageID())); } else { /// We will create a query to create an internal table. auto manual_create_query = std::make_shared(); manual_create_query->database = getStorageID().database_name; manual_create_query->table = generateInnerTableName(getStorageID()); auto new_columns_list = std::make_shared(); new_columns_list->set(new_columns_list->columns, query.columns_list->columns->ptr()); manual_create_query->set(manual_create_query->columns_list, new_columns_list); manual_create_query->set(manual_create_query->storage, query.storage->ptr()); InterpreterCreateQuery create_interpreter(manual_create_query, local_context); create_interpreter.setInternal(true); create_interpreter.execute(); target_table_id = DatabaseCatalog::instance().getTable({manual_create_query->database, manual_create_query->table}, global_context)->getStorageID(); } if (!select.select_table_id.empty()) DatabaseCatalog::instance().addDependency(select.select_table_id, getStorageID()); } QueryProcessingStage::Enum StorageMaterializedView::getQueryProcessingStage(const Context & context, QueryProcessingStage::Enum to_stage, const ASTPtr & query_ptr) const { return getTargetTable()->getQueryProcessingStage(context, to_stage, query_ptr); } Pipe StorageMaterializedView::read( const Names & column_names, const StorageMetadataPtr & /*metadata_snapshot*/, const SelectQueryInfo & query_info, const Context & context, QueryProcessingStage::Enum processed_stage, const size_t max_block_size, const unsigned num_streams) { auto storage = getTargetTable(); auto lock = storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout); auto metadata_snapshot = storage->getInMemoryMetadataPtr(); if (query_info.order_optimizer) query_info.input_order_info = query_info.order_optimizer->getInputOrder(storage, metadata_snapshot); Pipe pipe = storage->read(column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams); pipe.addTableLock(lock); return pipe; } BlockOutputStreamPtr StorageMaterializedView::write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) { auto storage = getTargetTable(); auto lock = storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout); auto metadata_snapshot = storage->getInMemoryMetadataPtr(); auto stream = storage->write(query, metadata_snapshot, context); stream->addTableLock(lock); return stream; } static void executeDropQuery(ASTDropQuery::Kind kind, Context & global_context, const StorageID & target_table_id) { if (DatabaseCatalog::instance().tryGetTable(target_table_id, global_context)) { /// We create and execute `drop` query for internal table. auto drop_query = std::make_shared(); drop_query->database = target_table_id.database_name; drop_query->table = target_table_id.table_name; drop_query->kind = kind; drop_query->no_delay = true; ASTPtr ast_drop_query = drop_query; InterpreterDropQuery drop_interpreter(ast_drop_query, global_context); drop_interpreter.execute(); } } void StorageMaterializedView::drop() { auto table_id = getStorageID(); const auto & select_query = getInMemoryMetadataPtr()->getSelectQuery(); if (!select_query.select_table_id.empty()) DatabaseCatalog::instance().removeDependency(select_query.select_table_id, table_id); if (has_inner_table && tryGetTargetTable()) executeDropQuery(ASTDropQuery::Kind::Drop, global_context, target_table_id); } void StorageMaterializedView::truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &) { if (has_inner_table) executeDropQuery(ASTDropQuery::Kind::Truncate, global_context, target_table_id); } void StorageMaterializedView::checkStatementCanBeForwarded() const { if (!has_inner_table) throw Exception( "MATERIALIZED VIEW targets existing table " + target_table_id.getNameForLogs() + ". " + "Execute the statement directly on it.", ErrorCodes::INCORRECT_QUERY); } bool StorageMaterializedView::optimize( const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const ASTPtr & partition, bool final, bool deduplicate, const Context & context) { checkStatementCanBeForwarded(); auto storage_ptr = getTargetTable(); auto metadata_snapshot = storage_ptr->getInMemoryMetadataPtr(); return getTargetTable()->optimize(query, metadata_snapshot, partition, final, deduplicate, context); } void StorageMaterializedView::alter( const AlterCommands & params, const Context & context, TableLockHolder &) { auto table_id = getStorageID(); StorageInMemoryMetadata new_metadata = getInMemoryMetadata(); StorageInMemoryMetadata old_metadata = getInMemoryMetadata(); params.apply(new_metadata, context); /// start modify query if (context.getSettingsRef().allow_experimental_alter_materialized_view_structure) { const auto & new_select = new_metadata.select; const auto & old_select = old_metadata.getSelectQuery(); DatabaseCatalog::instance().updateDependency(old_select.select_table_id, table_id, new_select.select_table_id, table_id); new_metadata.setSelectQuery(new_select); } /// end modify query DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata); setInMemoryMetadata(new_metadata); } void StorageMaterializedView::checkAlterIsPossible(const AlterCommands & commands, const Settings & settings) const { if (settings.allow_experimental_alter_materialized_view_structure) { for (const auto & command : commands) { if (!command.isCommentAlter() && command.type != AlterCommand::MODIFY_QUERY) throw Exception( "Alter of type '" + alterTypeToString(command.type) + "' is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED); } } else { for (const auto & command : commands) { if (!command.isCommentAlter()) throw Exception( "Alter of type '" + alterTypeToString(command.type) + "' is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED); } } } Pipe StorageMaterializedView::alterPartition( const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, const Context & context) { checkStatementCanBeForwarded(); return getTargetTable()->alterPartition(query, metadata_snapshot, commands, context); } void StorageMaterializedView::checkAlterPartitionIsPossible( const PartitionCommands & commands, const StorageMetadataPtr & metadata_snapshot, const Settings & settings) const { checkStatementCanBeForwarded(); getTargetTable()->checkAlterPartitionIsPossible(commands, metadata_snapshot, settings); } void StorageMaterializedView::mutate(const MutationCommands & commands, const Context & context) { checkStatementCanBeForwarded(); getTargetTable()->mutate(commands, context); } void StorageMaterializedView::renameInMemory(const StorageID & new_table_id) { auto old_table_id = getStorageID(); auto metadata_snapshot = getInMemoryMetadataPtr(); bool from_atomic_to_atomic_database = old_table_id.hasUUID() && new_table_id.hasUUID(); if (has_inner_table && tryGetTargetTable() && !from_atomic_to_atomic_database) { auto new_target_table_name = generateInnerTableName(new_table_id); auto rename = std::make_shared(); ASTRenameQuery::Table from; from.database = target_table_id.database_name; from.table = target_table_id.table_name; ASTRenameQuery::Table to; to.database = target_table_id.database_name; to.table = new_target_table_name; ASTRenameQuery::Element elem; elem.from = from; elem.to = to; rename->elements.emplace_back(elem); InterpreterRenameQuery(rename, global_context).execute(); target_table_id.table_name = new_target_table_name; } IStorage::renameInMemory(new_table_id); const auto & select_query = metadata_snapshot->getSelectQuery(); // TODO Actually we don't need to update dependency if MV has UUID, but then db and table name will be outdated DatabaseCatalog::instance().updateDependency(select_query.select_table_id, old_table_id, select_query.select_table_id, getStorageID()); } void StorageMaterializedView::shutdown() { auto metadata_snapshot = getInMemoryMetadataPtr(); const auto & select_query = metadata_snapshot->getSelectQuery(); /// Make sure the dependency is removed after DETACH TABLE if (!select_query.select_table_id.empty()) DatabaseCatalog::instance().removeDependency(select_query.select_table_id, getStorageID()); } StoragePtr StorageMaterializedView::getTargetTable() const { return DatabaseCatalog::instance().getTable(target_table_id, global_context); } StoragePtr StorageMaterializedView::tryGetTargetTable() const { return DatabaseCatalog::instance().tryGetTable(target_table_id, global_context); } Strings StorageMaterializedView::getDataPaths() const { if (auto table = tryGetTargetTable()) return table->getDataPaths(); return {}; } void StorageMaterializedView::checkTableCanBeDropped() const { /// Don't drop the target table if it was created manually via 'TO inner_table' statement if (!has_inner_table) return; auto target_table = tryGetTargetTable(); if (!target_table) return; target_table->checkTableCanBeDropped(); } void StorageMaterializedView::checkPartitionCanBeDropped(const ASTPtr & partition) { /// Don't drop the partition in target table if it was created manually via 'TO inner_table' statement if (!has_inner_table) return; auto target_table = tryGetTargetTable(); if (!target_table) return; target_table->checkPartitionCanBeDropped(partition); } ActionLock StorageMaterializedView::getActionLock(StorageActionBlockType type) { return has_inner_table ? getTargetTable()->getActionLock(type) : ActionLock{}; } void registerStorageMaterializedView(StorageFactory & factory) { factory.registerStorage("MaterializedView", [](const StorageFactory::Arguments & args) { /// Pass local_context here to convey setting for inner table return StorageMaterializedView::create( args.table_id, args.local_context, args.query, args.columns, args.attach); }); } }