Method format_unsigned

datafusion/spark/src/function/string/format_string.rs:1938–2003

(&self, writer: &mut String, value: u64)

    }

    fn format_unsigned(&self, writer: &mut String, value: u64) -> Result<()> {
        let mut s = String::new();
        let mut alt_prefix = "";
        match self.conversion_type {
            ConversionType::DecInt => {
                let num_str = format!("{value}");
                s = if self.grouping_separator {
                    insert_thousands_separator(&num_str)
                } else {
                    num_str
                };
            }
            ConversionType::HexIntLower => {
                alt_prefix = "0x";
                write!(&mut s, "{value:x}")
                    .map_err(|e| exec_datafusion_err!("Write error: {}", e))?;
            }
            ConversionType::HexIntUpper => {
                alt_prefix = "0X";
                write!(&mut s, "{value:X}")
                    .map_err(|e| exec_datafusion_err!("Write error: {}", e))?;
            }
            ConversionType::OctInt => {
                alt_prefix = "0";
                write!(&mut s, "{value:o}")
                    .map_err(|e| exec_datafusion_err!("Write error: {}", e))?;
            }
            _ => {
                return exec_err!(
                    "Invalid conversion type: {:?} for u64",
                    self.conversion_type
                );
            }
        }
        let mut prefix = if self.alt_form {
            alt_prefix.to_owned()
        } else {
            String::new()
        };

        let formatted = if let NumericParam::Literal(width) = self.width {
            if self.left_adj {
                let mut num_str = prefix + &s;
                while num_str.len() < width as usize {
                    num_str.push(' ');
                }
                num_str
            } else if self.zero_pad {
                while prefix.len() + s.len() < width as usize {
                    prefix.push('0');
                }
                prefix + &s
            } else {
                let mut num_str = prefix + &s;
                while num_str.len() < width as usize {
                    num_str = " ".to_owned() + &num_str;
                }
                num_str