[ARROW-10930] [Python] LargeListType doesn't have a value_field

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 3.0.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26858
• Assignee: Joris Van den Bossche
• Reporter: Jim Pivarski
• Created: 15/Dec/20 20:49
• Updated: 11/Jan/23 08:16
• Resolved: 04/Jan/21 12:39

Description

This one is easy: it looks like the LargeListType is just missing this field. Here it is for a 32-bit list (the reason I want this is to get at the "nullable" field, although the "metadata" would be nice, too):

>>> import pyarrow as pa
>>> small_array = pa.ListArray.from_arrays(pa.array([0, 3, 3, 5]), pa.array([1.1, 2.2, 3.3, 4.4, 5.5]))
>>> small_array.type.value_field
pyarrow.Field<item: double>
>>> small_array.type.value_field.nullable
True

Now with a large list:

>>> large_array = pa.LargeListArray.from_arrays(pa.array([0, 3, 3, 5]), pa.array([1.1, 2.2, 3.3, 4.4, 5.5]))
>>> large_array.type.value_field
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
AttributeError: 'pyarrow.lib.LargeListType' object has no attribute 'value_field'

Verifying version:

>>> pa.__version__
'2.0.0'

Issue Links

• links to: GitHub Pull Request #8979