zhuqi-lucas commented on code in PR #14499:
URL: https://github.com/apache/datafusion/pull/14499#discussion_r1942554373
##########
datafusion/physical-plan/src/stream.rs:
##########
@@ -444,18 +444,44 @@ impl Stream for EmptyRecordBatchStream {
pub(crate) struct ObservedStream {
inner: SendableRecordBatchStream,
baseline_metrics: BaselineMetrics,
+ fetch: Option<usize>,
+ produced: usize,
}
impl ObservedStream {
pub fn new(
inner: SendableRecordBatchStream,
baseline_metrics: BaselineMetrics,
+ fetch: Option<usize>,
) -> Self {
Self {
inner,
baseline_metrics,
+ fetch,
+ produced: 0,
}
}
+
+ fn limit_reached(
Review Comment:
We may can add a follow-up to reuse LimitStream which is used by
SortPreservingMergeExec
```rust
impl Stream for LimitStream {
type Item = Result<RecordBatch>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Self::Item>> {
let fetch_started = self.skip == 0;
let poll = match &mut self.input {
Some(input) => {
let poll = if fetch_started {
input.poll_next_unpin(cx)
} else {
self.poll_and_skip(cx)
};
poll.map(|x| match x {
Some(Ok(batch)) =>
Ok(self.stream_limit(batch)).transpose(),
other => other,
})
}
// Input has been cleared
None => Poll::Ready(None),
};
self.baseline_metrics.record_poll(poll)
}
}
```
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