presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitSetRole
class Formatter:        @Override
        protected Void visitSetRole(SetRole node, Integer context)
        {
            builder.append("SET ROLE ");
            SetRole.Type type = node.getType();
            switch (type) {
                case ALL:
                case NONE:
                    builder.append(type.toString());
                    break;
                case ROLE:
                    builder.append(node.getRole().get());
                    break;
                default:
                    throw new IllegalArgumentException("Unsupported type: " + type);
            }
            return null;
        }