presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryPageSinkProvider.java/MemoryPageSink/appendPage
class MemoryPageSink:        @Override
        public CompletableFuture<?> appendPage(Page page)
        {
            pagesStore.add(tableId, page);
            addedRows += page.getPositionCount();
            return NOT_BLOCKED;
        }