comphead commented on code in PR #15469:
URL: https://github.com/apache/datafusion/pull/15469#discussion_r2019237566


##########
datafusion/physical-plan/src/sorts/sort.rs:
##########
@@ -416,21 +409,23 @@ impl ExternalSorter {
                 Some(self.spill_manager.create_in_progress_file("Sorting")?);
         }
 
-        self.organize_stringview_arrays()?;
+        Self::organize_stringview_arrays(globally_sorted_batches)?;
 
         debug!("Spilling sort data of ExternalSorter to disk whilst 
inserting");
 
-        let batches = std::mem::take(&mut self.in_mem_batches);
+        let batches_to_spill = std::mem::take(globally_sorted_batches);
         self.reservation.free();
 
         let in_progress_file = 
self.in_progress_spill_file.as_mut().ok_or_else(|| {
             internal_datafusion_err!("In-progress spill file should be 
initialized")
         })?;
 
-        for batch in batches {
+        for batch in batches_to_spill {
             in_progress_file.append_batch(&batch)?;
         }
 
+        assert!(globally_sorted_batches.is_empty());

Review Comment:
   perhaps we can get rid of assert and return `Err`? if the code regressed the 
users can face the app crash



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