AlenkaF commented on code in PR #46884:
URL: https://github.com/apache/arrow/pull/46884#discussion_r3302641177
##########
python/pyarrow/pandas_compat.py:
##########
@@ -378,7 +378,10 @@ def _index_level_name(index, i, column_names):
if index.name is not None and index.name not in column_names:
return _column_name_to_strings(index.name)
else:
- return f'__index_level_{i:d}__'
+ j = i
+ while f'__index_level_{j:d}__' in column_names:
+ j += 1
+ return f'__index_level_{j:d}__'
Review Comment:
Isn't schema based conversion already buggy without this change when it
comes to the index levels? It probably silently ignores the duplicated level
`0` currently?
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