[GitHub] [arrow] AlenkaF commented on pull request #14493: ARROW-17360: [Python] Reorder columns in pyarrow.feather.read_table

[GitBox <gi...@apache.org>]

AlenkaF commented on PR #14493:
URL: https://github.com/apache/arrow/pull/14493#issuecomment-1293348987

   Yeah, that's unfortunate. `select()` with "dotted path" doesn't work for `pyarrow.Table` but works for `ORCF.read()`:
   ```python
   >       result4 = orc_file.read(columns=["struct.middle.inner"])
   
   opt/conda/envs/arrow/lib/python3.8/site-packages/pyarrow/tests/test_orc.py:584: 
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
   opt/conda/envs/arrow/lib/python3.8/site-packages/pyarrow/orc.py:189: in read
       table = table.select(columns)
   pyarrow/table.pxi:3053: in pyarrow.lib.Table.select
       ???
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
   
   >   ???
   E   KeyError: 'Field "struct.middle.inner" does not exist in table schema'
   ```
   
   Due to that the easy solution for reordering the columns isn't feasible anymore. Will close this PR and make another one, where I will add information to the docstrings that in `orc.read_table()` we always follow the order of the file.


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