Method format

datafusion/spark/src/function/string/format_string.rs:361–381

(&self, args: &[ScalarValue])

    }

    pub fn format(&self, args: &[ScalarValue]) -> Result<String> {
        if args.len() < self.arg_num {
            return exec_err!(
                "Expected at least {} arguments, got {}",
                self.arg_num,
                args.len()
            );
        }
        let mut string = String::new();
        for element in &self.elements {
            match element {
                FormatElement::Verbatim(text) => {
                    string.push_str(text);
                }
                FormatElement::Format(spec) => {
                    spec.format(&mut string, &args[spec.argument_index - 1])?;
                }
            }
        }
        Ok(string)
    }
}

#[derive(Debug)]