[ARROW-4434] [Python] Cannot create empty StructArray via pa.StructArray.from_arrays

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.13.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20993
• Assignee: Antoine Pitrou
• Reporter: Krisztian Szucs
• Created: 30/Jan/19 19:42
• Updated: 11/Jan/23 07:33
• Resolved: 11/Feb/19 20:32

Description

In [5]: pa.StructArray.from_arrays([], names=[])
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-5-d6fa9cf39f31> in <module>
----> 1 pa.StructArray.from_arrays([], names=[])

~/Workspace/arrow/python/pyarrow/array.pxi in pyarrow.lib.StructArray.from_arrays()
   1326         num_arrays = len(arrays)
   1327         if num_arrays == 0:
-> 1328             raise ValueError("arrays list is empty")
   1329
   1330         length = len(arrays[0])

ValueError: arrays list is empty

however

pa.array([], type=pa.struct([]))

works

Issue Links

• links to: GitHub Pull Request #3610