andygrove commented on code in PR #1440:
URL: https://github.com/apache/datafusion-comet/pull/1440#discussion_r1972545720
##########
native/core/src/execution/shuffle/shuffle_writer.rs:
##########
@@ -572,15 +567,12 @@ impl ShuffleRepartitioner {
output_data.write_all(&output_batches[i])?;
output_batches[i].clear();
- // append partition in each spills
- for spill in &output_spills {
- let length = spill.offsets[i + 1] - spill.offsets[i];
- if length > 0 {
- let mut spill_file =
-
BufReader::new(File::open(spill.file.path()).map_err(Self::to_df_err)?);
- spill_file.seek(SeekFrom::Start(spill.offsets[i]))?;
- std::io::copy(&mut spill_file.take(length), &mut
output_data)
- .map_err(Self::to_df_err)?;
+ if let Some(spill_data) =
self.buffered_partitions[i].spill_file.as_ref() {
Review Comment:
Yes, that is correct. We never truncate the spill file. We just append to
it. At the end of the shuffle, we copy the contents of each spill file to the
shuffle file. I will add some comments to make this clearer.
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