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: column.rs
    path of file: ./repos/libsql/vendored/rusqlite/src
    
    the code of the file until where you have to start completion: use std::str;

use crate::{Error, Result, Statement};

/// Information about a column of a SQLite query.
#[derive(Debug)]
pub struct Column<'stmt> {
    name: &'stmt str,
    decl_type: Option<&'stmt str>,
}

impl Column<'_> {
    /// Returns the name of the column.
    #[inline]
    #[must_use]
    pub fn name(&self) -> &str {
        self.name
    }

    /// Returns the type of the column (`None` for expressio
    
    pub fn columns(&self) -> Vec<Column> {
        let n = self.column_count();
        let mut cols = Vec::with_capacity(n);
        for i in 0..n {
            let name = self.column_name_unwrap(i);
            let slice = self.stmt.column_decltype(i);
            let decl_type = slice.map(|s| {
                str::from_utf8(s.to_bytes()).expect("Invalid UTF-8 sequence in column declaration")
            });
            cols.push(Column { name, decl_type });
        }
        cols
    }