[GitHub] [arrow] jorisvandenbossche commented on issue #25672: [Python] Struct types are unhandled in AppendNdarrayItem when converting from a Python sequence to Arrow array in python_to_arrow.cc

["jorisvandenbossche (via GitHub)" <gi...@apache.org>]

jorisvandenbossche commented on issue #25672:
URL: https://github.com/apache/arrow/issues/25672#issuecomment-1481577090

   We don't have an exact reproducer, but so this is something that failed in the past with a similar error (the list item is a numpy array instead of a list):
   
   ```
   In [1]: pa.array([np.array([{'a': 1, 'b': 2}, {'a': 3, 'b': 4}], dtype=object)])
   ...
   ArrowTypeError: Unknown list item type: struct<a: int64, b: int64>
   ```
   
   And that now works:
   
   ```
   In [1]: pa.array([np.array([{'a': 1, 'b': 2}, {'a': 3, 'b': 4}], dtype=object)])
   Out[1]: 
   <pyarrow.lib.ListArray object at 0x7fa6eccc3700>
   [
     -- is_valid: all not null
     -- child 0 type: int64
       [
         1,
         3
       ]
     -- child 1 type: int64
       [
         2,
         4
       ]
   ]
   In [2]: _.type
   Out[2]: ListType(list<item: struct<a: int64, b: int64>>)
   ```
   
   So closing this.


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