Method call

src/expr/src/scalar/func/impls/string.rs:184–192

(&self, a: Self::Input<'a>)

    type Output<'a> = Result<Numeric, EvalError>;

    fn call<'a>(&self, a: Self::Input<'a>) -> Self::Output<'a> {
        let mut d = strconv::parse_numeric(a)?;
        if let Some(scale) = self.0 {
            if numeric::rescale(&mut d.0, scale.into_u8()).is_err() {
                return Err(EvalError::NumericFieldOverflow);
            }
        }
        Ok(d.into_inner())
    }

    fn output_sql_type(&self, input: SqlColumnType) -> SqlColumnType {
        SqlScalarType::Numeric { max_scale: self.0 }.nullable(input.nullable)