pitrou commented on a change in pull request #8317:
URL: https://github.com/apache/arrow/pull/8317#discussion_r499611181
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File path: python/pyarrow/_dataset.pyx
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@@ -962,6 +962,10 @@ cdef class ParquetFileFragment(FileFragment):
return None
return [RowGroupInfo.wrap(row_group) for row_group in c_row_groups]
+ @property
+ def num_row_groups(self):
+ return None if self.row_groups is None else len(self.row_groups)
Review comment:
Is there a way to do this without reifying `self.row_groups`? Or is it
cheap enough?
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