Function bind_formula 

pub fn bind_formula<F>(
    formula: &mut FormulaExpr,
    lookup: &F,
    positional: &[Value],
    bind_filter_fn: &impl Fn(&mut FilterExpr, &F, &[Value]) -> Result<(), QqlError>,
) -> Result<(), QqlError>
where
    F: Fn(&str) -> Option<Value>,

Recursively bind parameters into a FormulaExpr in-place.