presto-orc/src/main/java/io/prestosql/orc/OrcBlockFactory.java/OrcBlockFactory/OrcBlockLoader
class OrcBlockFactory:        public OrcBlockLoader(OrcBlockReader blockReader, boolean loadFully)
        {
            this.blockReader = requireNonNull(blockReader, "blockReader is null");
            this.loadFully = loadFully;
        }