Method reserve

datafusion/execution/src/memory_pool/arrow.rs:60–66

(&self, size: usize)

impl arrow_buffer::MemoryPool for ArrowMemoryPool {
    fn reserve(&self, size: usize) -> Box<dyn arrow_buffer::MemoryReservation> {
        let consumer = self.consumer.clone_with_new_id();
        let reservation = consumer.register(&self.inner);
        reservation.grow(size);

        Box::new(reservation)
    }

    fn available(&self) -> isize {
        // The pool may be overfilled, so this method might return a negative value.