wgtmac commented on code in PR #49527:
URL: https://github.com/apache/arrow/pull/49527#discussion_r2964395482


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cpp/src/parquet/file_writer.h:
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@@ -34,6 +34,13 @@ class ColumnWriter;
 static constexpr uint8_t kParquetMagic[4] = {'P', 'A', 'R', '1'};
 static constexpr uint8_t kParquetEMagic[4] = {'P', 'A', 'R', 'E'};
 
+struct PARQUET_EXPORT BufferedStats {

Review Comment:
   Agreed. We can add a comment to explain that this is for uncompressed values 
that do not belong to any page and buffered by page writers.
   
   We can also make it an inner class of the `RowGroupWriter` class.



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