Method file_extension

datafusion/datasource/src/url.rs:220–230

Returns the file extension of the last path segment if it exists Examples: ```rust use datafusion_datasource::ListingTableUrl; let url = ListingTableUrl::parse("file:///foo/bar.csv").unwrap(); assert_eq!(url.file_extension(), Some("csv")); let url = ListingTableUrl::parse("file:///foo/bar").unwrap(); assert_eq!(url.file_extension(), None); let url = ListingTableUrl::parse("file:///foo/bar.").unwr

(&self)

    /// assert_eq!(url.file_extension(), None);
    /// ```
    pub fn file_extension(&self) -> Option<&str> {
        if let Some(mut segments) = self.url.path_segments()
            && let Some(last_segment) = segments.next_back()
            && last_segment.contains(".")
            && !last_segment.ends_with(".")
        {
            return last_segment.split('.').next_back();
        }

        None
    }

    /// Strips the prefix of this [`ListingTableUrl`] from the provided path, returning
    /// an iterator of the remaining path segments