alamb commented on code in PR #16319:
URL: https://github.com/apache/datafusion/pull/16319#discussion_r2134861645
##########
datafusion/physical-plan/src/sorts/sort.rs:
##########
@@ -1126,14 +1127,20 @@ impl ExecutionPlan for SortExec {
Ok(Box::pin(RecordBatchStreamAdapter::new(
self.schema(),
futures::stream::once(async move {
- while let Some(batch) = input.next().await {
- let batch = batch?;
- topk.insert_batch(batch)?;
- if topk.finished {
- break;
+ // Spawn a task the first time the stream is polled
for the sort phase.
+ // This ensures the consumer of the sort does not poll
unnecessarily
+ // while the sort is ongoing
Review Comment:
I may not fully understand this change, but I believe it will start
generating input as soon as `execute` is called, rather than waiting for the
first poll...
Another potential problem is that it will disconnect the production of
batches from the consumption of them -- in other words by design I think it
will potentially produce batches on a different thread than consumes them
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