presto-main/src/main/java/io/prestosql/sql/gen/InputReferenceCompiler.java/InputReferenceNode/produceBlockAndPosition
class InputReferenceNode:        public BytecodeNode produceBlockAndPosition()
        {
            BytecodeBlock blockAndPosition = new BytecodeBlock();
            blockAndPosition.append(block);
            blockAndPosition.append(position);
            return blockAndPosition;
        }