code: def test_set_memory_pool():
      old_pool = pa.default_memory_pool()
      pool = pa.proxy_memory_pool(old_pool)
      pa.set_memory_pool(pool)
      try:
          allocated_before = pool.bytes_allocated()
          with allocate_bytes(None, 512):
              assert pool.bytes_allocated() == allocated_before + 512
          assert pool.bytes_allocated() == allocated_before
      finally:
          pa.set_memory_pool(old_pool)
  
imports: import contextlib
  import os
  import signal
  import subprocess
  import sys
  import weakref
  import pyarrow
  import pytest
label_desc: Use image node_id 7 for calling a global function with example usage: test_set_memory_pool() without return types