Dandandan commented on code in PR #8146:
URL: https://github.com/apache/arrow-rs/pull/8146#discussion_r2280304174


##########
arrow-select/src/coalesce.rs:
##########
@@ -236,6 +262,13 @@ impl BatchCoalescer {
     /// assert_eq!(completed_batch, expected_batch);
     /// ```
     pub fn push_batch(&mut self, batch: RecordBatch) -> Result<(), ArrowError> 
{
+        if let Some(limit) = self.biggest_coalesce_batch_size {

Review Comment:
   I wonder if this makes only sense whenever there are no in progress batches?
   So whenever we get a large batch and we do not need to copy, just output the 
batch, in other cases go on with the default path.



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