emkornfield commented on code in PR #40594:
URL: https://github.com/apache/arrow/pull/40594#discussion_r1704931224


##########
cpp/src/parquet/column_writer.cc:
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@@ -789,11 +793,13 @@ class ColumnWriterImpl {
   // Serializes Dictionary Page if enabled
   virtual void WriteDictionaryPage() = 0;
 
+  using StatisticsPair = std::pair<EncodedStatistics, 
std::shared_ptr<SizeStatistics>>;

Review Comment:
   nit: using a custom struct can be easier to read (and should I believe still 
support destructuring).
   
   Maybe make a note that the first element isn't a pointer because it is 
required but the second one is optional IIUC?



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