alamb commented on code in PR #4280:
URL: https://github.com/apache/arrow-rs/pull/4280#discussion_r1207429061


##########
parquet/src/arrow/arrow_writer/mod.rs:
##########
@@ -152,43 +147,75 @@ impl<W: Write> ArrowWriter<W> {
         self.writer.flushed_row_groups()
     }
 
-    /// Enqueues the provided `RecordBatch` to be written
+    /// Returns the length in bytes of the current in progress row group
+    pub fn in_progress_size(&self) -> usize {

Review Comment:
   Can we make this API return the upper bound? Otherwise I am not sure how 
useful it is 🤔 



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