zeevm commented on a change in pull request #7586:
URL: https://github.com/apache/arrow/pull/7586#discussion_r448764844



##########
File path: rust/parquet/src/column/writer.rs
##########
@@ -216,26 +278,26 @@ impl<T: DataType> ColumnWriterImpl<T> {
             def_levels_sink: vec![],
             rep_levels_sink: vec![],
             data_pages: VecDeque::new(),
+            min_page_value: None,
+            max_page_value: None,
+            num_page_nulls: 0,
+            page_distinct_count: None,

Review comment:
       All of them are used, page_distinct_count isn't being calculated in this 
PR though, probably a following PR




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