Method shrink

datafusion/execution/src/memory_pool/mod.rs:404–415

Frees `capacity` bytes from this reservation # Panics Panics if `capacity` exceeds [`Self::size`]

(&self, capacity: usize)

    ///
    /// Panics if `capacity` exceeds [`Self::size`]
    pub fn shrink(&self, capacity: usize) {
        self.size
            .fetch_update(
                atomic::Ordering::Relaxed,
                atomic::Ordering::Relaxed,
                |prev| prev.checked_sub(capacity),
            )
            .unwrap_or_else(|prev| {
                panic!("Cannot free the capacity {capacity} out of allocated size {prev}")
            });
        self.registration.pool.shrink(self, capacity);
    }

    /// Tries to free `capacity` bytes from this reservation
    /// if `capacity` does not exceed [`Self::size`].