code: def test_v2_lz4_default_compression():
      # ARROW-8750: Make sure that the compression=None option selects lz4 if
      # it's available
      if not pa.Codec.is_available("lz4_frame"):
          pytest.skip("LZ4 compression support is not built in C++")
  
      # some highly compressible data
      t = pa.table([np.repeat(0, 100000)], names=["f0"])
  
      buf = io.BytesIO()
      write_feather(t, buf)
      default_result = buf.getvalue()
  
      buf = io.BytesIO()
      write_feather(t, buf, compression="uncompressed")
      uncompressed_result = buf.getvalue()
  
      assert len(default_result) < len(uncompressed_result)
  
imports: import io
  import os
  import sys
  import tempfile
  import pytest
  import hypothesis
  import hypothesis.strategies
  import numpy
  import pyarrow
  import pyarrow.tests.strategies
  from pyarrow.feather import read_feather, write_feather, read_table, FeatherDataset
label_desc: Use image node_id 47 for calling a global function with example usage: test_v2_lz4_default_compression() without return types