2010YOUY01 commented on code in PR #15700:
URL: https://github.com/apache/datafusion/pull/15700#discussion_r2191875936
##########
datafusion/physical-plan/src/aggregates/row_hash.rs:
##########
@@ -1067,14 +1074,13 @@ impl GroupedHashAggregateStream {
sort_batch(&batch, &expr, None)
})),
)));
- for spill in self.spill_state.spills.drain(..) {
- let stream =
self.spill_state.spill_manager.read_spill_as_stream(spill)?;
- streams.push(stream);
- }
+
self.spill_state.is_stream_merging = true;
self.input = StreamingMergeBuilder::new()
.with_streams(streams)
.with_schema(schema)
+ .with_spill_manager(self.spill_state.spill_manager.clone())
+ .with_sorted_spill_files(std::mem::take(&mut
self.spill_state.spills))
Review Comment:
Yes, but I think this is likely a small slowdown.
Comparing to 90% of the memory is taken by in-memory streams, and we have to
use the remaining 10% to re-spill lots of spills, this case can cause huge
slowdown.
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