HuaHuaY commented on code in PR #9619:
URL: https://github.com/apache/arrow-rs/pull/9619#discussion_r3666586303
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parquet/src/file/statistics.rs:
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@@ -139,6 +139,8 @@ pub(crate) fn from_thrift_page_stats(
.transpose()?;
// Generic distinct count (count of distinct values occurring)
let distinct_count = stats.distinct_count.map(|value| value as
u64);
+ // Generic nan count for floating point types
+ let nan_count = stats.nan_count.map(|value| value as u64);
Review Comment:
Should it throw an error when the count is negative, just like with
`null_count`? Would it be better to treat negative values in both cases as
"missing"? I noticed that Arrow C++ doesn't handle negative values, so I try to
follow the Rust implementation behavior.
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