Function extract_f64

nodedb-query/src/msgpack_scan/aggregate_helpers.rs:31–37

(doc: &[u8], field: &str, expr: Option<&SqlExpr>)

/// Returns `None` when the field is absent or cannot be converted to f64.
#[inline]
pub fn extract_f64(doc: &[u8], field: &str, expr: Option<&SqlExpr>) -> Option<f64> {
    if let Some(expr) = expr {
        return value_ops::value_to_f64(&eval_expr(doc, expr)?, false);
    }
    let (start, _end) = extract_field(doc, 0, field)?;
    read_f64(doc, start)
}

/// Extract a display string from `field`, or evaluate `expr` if provided.
/// Returns `None` when the field is absent.