You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: handle.rs
    path of file: ./repos/rbatis/rbdc-sqlite/src/statement
    
    the code of the file until where you have to start completion: use std::ffi::c_void;
use std::ffi::CStr;

use crate::type_info::DataType;
use crate::{SqliteError, SqliteTypeInfo};
use libsqlite3_sys::{
    sqlite3, sqlite3_bind_blob64, sqlite3_bi
    
    pub(crate) fn column_blob(&self, index: usize) -> &[u8] {
        let index = index as c_int;
        let len = unsafe { sqlite3_column_bytes(self.0.as_ptr(), index) } as usize;

        if len == 0 {
            // empty blobs are NULL so just return an empty slice
            return &[];
        }

        let ptr = unsafe { sqlite3_column_blob(self.0.as_ptr(), index) } as *const u8;
        debug_assert!(!ptr.is_null());

        unsafe { from_raw_parts(ptr, len) }
    }