[GitHub] [arrow] spenczar commented on issue #37072: null structarrays are poorly handled by cast

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

spenczar commented on issue #37072:
URL: https://github.com/apache/arrow/issues/37072#issuecomment-1670413898

   With a bit more inspection, I'm now wondering if the blame really lies with `pa.nulls` (so, the C++ function `MakeArrayOfNull`).
   
   If I do this:
   ```py
   nulls = pa.array([None, None, None, None, None], struct_type)
   ```
   Then everything works fine!
   
   ```py
   nulls = nulls.cast(struct_type)
   print(nulls)
   -- is_valid:
     [
       false,
       false,
       false,
       false,
       false
     ]
   -- child 0 type: int32
     [
       null,
       null,
       null,
       null,
       null
     ]
   ```
   


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