[Python] Large memory test failures

[asfimport]

I get the following errors when running pytest --large_memory:

____________________________________________________________________ test_chunked_binary_error_message _____________________________________________________________________
Traceback (most recent call last):
  File "/home/antoine/arrow/dev/python/pyarrow/tests/test_feather.py", line 566, in test_chunked_binary_error_message
    write_feather(df, io.BytesIO())
  File "/home/antoine/arrow/dev/python/pyarrow/feather.py", line 182, in write_feather
    writer.write(df)
  File "/home/antoine/arrow/dev/python/pyarrow/feather.py", line 96, in write
    check_chunked_overflow(col)
  File "/home/antoine/arrow/dev/python/pyarrow/feather.py", line 68, in check_chunked_overflow
    "lifted in the future".format(col.name))
AttributeError: 'pyarrow.lib.ChunkedArray' object has no attribute 'name'
_______________________________________________________________ TestConvertStructTypes.test_from_numpy_large _______________________________________________________________
Traceback (most recent call last):
  File "/home/antoine/arrow/dev/python/pyarrow/tests/test_pandas.py", line 2010, in test_from_numpy_large
    assert arr.num_chunks == 2
AttributeError: 'pyarrow.lib.StructArray' object has no attribute 'num_chunks'

Reporter: Antoine Pitrou / @pitrou
Assignee: Wes McKinney / @wesm

PRs and other links:

• GitHub Pull Request #5128

_{Note: This issue was originally created as ARROW-6067. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 5128
#5128