presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorPageSink.java/PageStore/PageStore
class PageStore:        public PageStore(PageBuffer pageBuffer, List<Type> columnTypes)
        {
            this.pageBuffer = requireNonNull(pageBuffer, "pageBuffer is null");
            this.pageBuilder = new PageBuilder(columnTypes);
        }