Method append_with

datafusion/functions/src/strings.rs:519–530

(&mut self, f: F)

    /// Panics if the cumulative byte length exceeds `O::MAX`.
    #[inline]
    pub fn append_with<F>(&mut self, f: F)
    where
        F: FnOnce(&mut GenericStringWriter<'_>),
    {
        let mut writer = GenericStringWriter {
            value_buffer: &mut self.value_buffer,
        };
        f(&mut writer);
        let next_offset =
            O::from_usize(self.value_buffer.len()).expect("byte array offset overflow");
        self.offsets_buffer.push(next_offset);
    }

    /// Finalize into a [`GenericStringArray<O>`] using the caller-supplied
    /// null buffer.