kou commented on code in PR #47183:
URL: https://github.com/apache/arrow/pull/47183#discussion_r2239583273
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python/pyarrow/tests/parquet/test_parquet_file.py:
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@@ -348,6 +348,7 @@ def test_read_statistics():
statistics = pq.ParquetFile(buf).read().columns[0].chunks[0].statistics
assert statistics.null_count == 1
assert statistics.distinct_count is None
+ assert statistics.is_distinct_count_exact is False
Review Comment:
Good point.
It's difficult for now... We don't provide a custom
`ArrayStatistics.distinct_count` API for now. We need to build
`ArrayStatistics.distinct_count` from statistics in Apache Parquet. But the
current Apache Parquet writer doesn't support `distinct_count` yet.
So we don't have `is_distinct_count_exact` == `None`/`True` code paths for
now...
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