pitrou commented on code in PR #46463:
URL: https://github.com/apache/arrow/pull/46463#discussion_r2095236912
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cpp/src/parquet/metadata.h:
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@@ -143,6 +143,7 @@ class PARQUET_EXPORT ColumnChunkMetaData {
bool is_stats_set() const;
bool is_geo_stats_set() const;
std::shared_ptr<Statistics> statistics() const;
+ std::shared_ptr<EncodedStatistics> encoded_statistics() const;
Review Comment:
Yes, I agree that it can be beneficial, for example if one is only
interested in the null count.
Note that `EncodedStatistics` is [already exposed on
`DataPage`](https://github.com/apache/arrow/blob/7f645d404a16e8c7c939dec70ad61f4ae4de7730/cpp/src/parquet/column_page.h#L68),
so it makes sense to expose it here as well.
A separate improvement would be to make the construction of TypedStatistics
faster, for example creating a decoder instance just to PLAIN-decode one value
does not really make sense. But that's a bit orthogonal IMHO.
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