code: def test_schema_weakref():
      fields = [
          pa.field("foo", pa.int32()),
          pa.field("bar", pa.string()),
          pa.field("baz", pa.list_(pa.int8())),
      ]
      schema = pa.schema(fields)
      wr = weakref.ref(schema)
      assert wr() is not None
      del schema
      assert wr() is None
  
imports: from collections import OrderedDict
  import sys
  import weakref
  import pytest
  import numpy
  import pyarrow
  import pyarrow.tests.util
  from pyarrow.vendored.version import Version
label_desc: Use image node_id 13 for calling a global function with example usage: test_schema_weakref() without return types