Method split

datafusion/execution/src/memory_pool/mod.rs:487–499

Splits off `capacity` bytes from this [`MemoryReservation`] into a new [`MemoryReservation`] with the same [`MemoryConsumer`]. This can be useful to free part of this reservation with RAAI style dropping # Panics Panics if `capacity` exceeds [`Self::size`]

(&self, capacity: usize)

    ///
    /// Panics if `capacity` exceeds [`Self::size`]
    pub fn split(&self, capacity: usize) -> MemoryReservation {
        self.size
            .fetch_update(
                atomic::Ordering::Relaxed,
                atomic::Ordering::Relaxed,
                |prev| prev.checked_sub(capacity),
            )
            .unwrap();
        Self {
            size: atomic::AtomicUsize::new(capacity),
            registration: Arc::clone(&self.registration),
        }
    }

    /// Returns a new empty [`MemoryReservation`] with the same [`MemoryConsumer`]
    pub fn new_empty(&self) -> Self {