sanjibansg commented on a change in pull request #12560:
URL: https://github.com/apache/arrow/pull/12560#discussion_r838405926
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File path: python/pyarrow/_dataset.pyx
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@@ -240,14 +240,22 @@ cdef class Dataset(_Weakrefable):
columns : list of str, default None
The columns to project. This can be a list of column names to
include (order and duplicates will be preserved), or a dictionary
- with {new_column_name: expression} values for more advanced
+ with {{new_column_name: expression}} values for more advanced
projections.
+
+ The list of columns or expressions may use the special fields
+ like `__batch_index` (the index of the batch within the
fragment),
Review comment:
Corrected that, thanks!
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