viirya commented on code in PR #271:
URL: 
https://github.com/apache/arrow-datafusion-comet/pull/271#discussion_r1567709071


##########
core/src/execution/operators/copy.rs:
##########
@@ -149,7 +149,10 @@ impl CopyStream {
             .iter()
             .map(|v| copy_or_cast_array(v))
             .collect::<Result<Vec<ArrayRef>, _>>()?;
-        RecordBatch::try_new(self.schema.clone(), vectors).map_err(|e| 
arrow_datafusion_err!(e))
+
+        let options = 
RecordBatchOptions::new().with_row_count(Some(batch.num_rows()));
+        RecordBatch::try_new_with_options(self.schema.clone(), vectors, 
&options)

Review Comment:
   Good catch. Although I'm not sure if it is possible to have `Expand` with 
empty projections, it is good to have it here too. I will add it in this PR as 
it is a simple change.



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