mbutrovich commented on code in PR #1440:
URL: https://github.com/apache/datafusion-comet/pull/1440#discussion_r1972447242
##########
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:
This is basically saying, if 1) We have a SpillFile, and 2) the length of
that SpillFile is greater than 0 -> we need to copy that spilled data to the
output buffer. My question is: because we're now reusing spill files instead of
creating them for each spill event, when does the reused SpillFile get
truncated back to 0 now that we've copied all of the data to `output_data`?
It's very likely it's happening somewhere that I don't see, so perhaps a
comment here where that happens.
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