Method String

duckdbservice/arrowmap/arrowmap.go:343–363

String renders the decimal in plain numeric form, e.g. {314159, 5} → "3.14159" and {-5, 2} → "-0.05". Required so the PG text-protocol formatter (server.formatValue) and any other fmt.Sprint-based callers produce a number string instead of falling back to the Go default "{value scale}" struct render

()

// "{value scale}" struct rendering. Negative values keep the sign in
// front of the integer part. Scale 0 prints as the integer.
func (d DecimalValue) String() string {
	if d.Value == nil {
		return "0"
	}
	if d.Scale <= 0 {
		return d.Value.String()
	}
	abs := new(big.Int).Abs(d.Value).String()
	// Left-pad with zeros so the digit count is at least Scale+1, giving us
	// room to insert the decimal point even when |Value| < 10^Scale.
	if pad := d.Scale + 1 - len(abs); pad > 0 {
		abs = strings.Repeat("0", pad) + abs
	}
	intPart := abs[:len(abs)-d.Scale]
	fracPart := abs[len(abs)-d.Scale:]
	sign := ""
	if d.Value.Sign() < 0 {
		sign = "-"
	}
	return sign + intPart + "." + fracPart
}

// Appender is a hook that handles append for value types arrowmap doesn't
// know about (typically driver-specific types like duckdb.Interval). It