AlenkaF opened a new issue, #49566:
URL: https://github.com/apache/arrow/issues/49566

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   I am running into a similar issue as discussed here: 
https://github.com/apache/arrow/pull/49476 (macos user).
   
   Import of pyarrow is successful from the `arrow/` directory when doing a 
non-editable install (import is not working in `arrow/python/` though). But 
trying to do an editable install doesn't work:
   
   ```
     *** Making editable...
     *** Created 
pyarrow-20.0.0.dev1549+g6dfef9428-cp314-cp314-macosx_26_0_arm64.whl
     Building editable for pyarrow (pyproject.toml) ... done
     Created wheel for pyarrow: 
filename=pyarrow-20.0.0.dev1549+g6dfef9428-cp314-cp314-macosx_26_0_arm64.whl 
size=4977549 
sha256=ce413dfaa48170f292fdfec7209c96f572bcbfaf53ff231613961f75cb03584c
     Stored in directory: 
/private/var/folders/_h/78_6x1357y7f8nh15scyz69c0000gn/T/pip-ephem-wheel-cache-6ggs7dg9/wheels/43/1e/32/0b8e404ed4ea8d880029148f761ab6b9f028c7c3a2da5ca70f
   Successfully built pyarrow
   Installing collected packages: pyarrow
     Attempting uninstall: pyarrow
       Found existing installation: pyarrow 20.0.0.dev1549+g6dfef9428
       Uninstalling pyarrow-20.0.0.dev1549+g6dfef9428:
         Created temporary directory: 
/private/var/folders/_h/78_6x1357y7f8nh15scyz69c0000gn/T/pip-uninstall-okf0ryow
         Removing file or directory 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/__pycache__/_pyarrow_editable.cpython-314.pyc
         Created temporary directory: 
/private/var/folders/_h/78_6x1357y7f8nh15scyz69c0000gn/T/pip-uninstall-hrn577ot
         Removing file or directory 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/_pyarrow_editable.pth
         Removing file or directory 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/_pyarrow_editable.py
         Created temporary directory: 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/~yarrow-20.0.0.dev1549+g6dfef9428.dist-info
         Removing file or directory 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/pyarrow-20.0.0.dev1549+g6dfef9428.dist-info/
         Created temporary directory: 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/~yarrow
         Removing file or directory 
/Users/alenkafrim/Repos/pyarrow-dev/lib/python3.14/site-packages/pyarrow/
         Successfully uninstalled pyarrow-20.0.0.dev1549+g6dfef9428
   
   Successfully installed pyarrow-20.0.0.dev1549+g6dfef9428
   Remote version of pip: 26.0.1
   Local version of pip:  26.0.1 
   ```
   
   and then trying to import:
   
   ```python
   (pyarrow-dev) ➜  python git:(main) ✗ python -c "import pyarrow"              
                    
   Traceback (most recent call last):
     File "<string>", line 1, in <module>
       import pyarrow
     File "/Users/alenkafrim/Repos/arrow/python/pyarrow/__init__.py", line 59, 
in <module>
       from pyarrow.lib import (BuildInfo, CppBuildInfo, RuntimeInfo, 
set_timezone_db_path,
       ...<3 lines>...
                                io_thread_count, is_opentelemetry_enabled, 
set_io_thread_count)
   ModuleNotFoundError: No module named 'pyarrow.lib'
   ```
   
   I investigated the issue with Claude and this diff fixed it:
   
   ```
   diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
   index 6395b3e1e7..388e9be4f5 100644
   --- a/python/CMakeLists.txt
   +++ b/python/CMakeLists.txt
   @@ -968,6 +968,9 @@ foreach(module ${CYTHON_EXTENSIONS})
            continue()
          endif()
        endif()
   +    if(output MATCHES "\\.h$")
   +      continue()
   +    endif()
        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${output} DESTINATION ".")
      endforeach()
    endforeach()
   ```
   
   The `lib.h` and `lib_api.h` were installed in the same dir as the compiled 
`.so` files causing issues when looking for `lib.*.so` compiled file. Note, 
`lib.h` and `lib_api.h` are already installed to arrow/python:
   
   
https://github.com/apache/arrow/blob/d08d5e64fcfd8759d3a7089eced3e9a2d7a17f20/python/CMakeLists.txt#L987-L988
   
   ### Component(s)
   
   Python


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