jorisvandenbossche commented on PR #40418:
URL: https://github.com/apache/arrow/pull/40418#issuecomment-1991059827

   > Is there any chance of weird caching :(?
   
   Caching is certainly a possible issue. I did try to ensure the docker images 
are rebuilt from scratch (that was originally the reason it was failing, 
because it was using a cached image that didn't have the latest numpy changes)
   
   But I see that in the older build with cached image, it has the same warning 
with same line number:
   
   ```
   2024-03-10T13:57:07.9851634Z 
C:\Python312\Lib\site-packages\numpy\_core\include\numpy\ndarraytypes.h(1250,38):
 warning C4200: nonstandard extension used: zero-sized array in struct/union 
[C:\arrow\python\build\temp.win-amd64-cpython-312\arrow_python.vcxproj]
   ```
   
   So that might point to the fact that it is still using the same numpy now in 
the last build, otherwise I assume at least that number should have changed a 
bit, given that your PR adding those definitions touched ndarraytypes.h


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