mapleFU commented on code in PR #48468:
URL: https://github.com/apache/arrow/pull/48468#discussion_r2788390264


##########
cpp/src/parquet/file_writer.cc:
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@@ -640,6 +667,29 @@ void ParquetFileWriter::AddKeyValueMetadata(
   }
 }
 
+std::optional<double> ParquetFileWriter::EstimateCompressedBytesPerRow() const 
{

Review Comment:
   I think current outside caller can implement this themselve, there is no 
need to encapsulate in `ParquetFileWriter`?



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