[BUG] Name of Columns being Shifted when Written

[mlahir1]

Name of Columns being Shifted when Written as first col becomes __index_level_0__ and rest of the columns are shifted by 1.

Repro code:

>>> df= cudf.DataFrame()
>>> for c in range(10):
...   df[f'_col{c}'] = range(10)
... 
>>> df = df[df._col1.isin([0,1,2,3])]
>>> df
   _col0  _col1  _col2  _col3  _col4  _col5  _col6  _col7  _col8  _col9
0      0      0      0      0      0      0      0      0      0      0
1      1      1      1      1      1      1      1      1      1      1
2      2      2      2      2      2      2      2      2      2      2
3      3      3      3      3      3      3      3      3      3      3
>>> df.to_orc('test.orc')
>>> cudf.read_orc('test.orc')
   __index_level_0__  _col0  _col1  _col2  _col3  _col4  _col5  _col6  _col7  _col8
0                  0      0      0      0      0      0      0      0      0      0
1                  1      1      1      1      1      1      1      1      1      1
2                  2      2      2      2      2      2      2      2      2      2
3                  3      3      3      3      3      3      3      3      3      3
>>> df.to_orc('test.orc', use_index=False)
>>> cudf.read_orc('test.orc')
   __index_level_0__  _col0  _col1  _col2  _col3  _col4  _col5  _col6  _col7  _col8
0                  0      0      0      0      0      0      0      0      0      0
1                  1      1      1      1      1      1      1      1      1      1
2                  2      2      2      2      2      2      2      2      2      2
3                  3      3      3      3      3      3      3      3      3      3

[mlahir1]

df = df.reset_index().drop(columns=['index']) before to_orc, get around the issue.

[github-actions]

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