Fokko commented on code in PR #34429:
URL: https://github.com/apache/arrow/pull/34429#discussion_r1127399251


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python/pyarrow/_dataset.pyx:
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@@ -891,8 +891,13 @@ cdef class FileFormat(_Weakrefable):
         filesystem : Filesystem, optional
             If `filesystem` is given, `file` must be a string and specifies
             the path of the file to read from the filesystem.
-        partition_expression : Expression
+        partition_expression : Expression, optional
             The filter expression.

Review Comment:
   Ah, I missed that one as well. Thanks!



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