thinkharderdev commented on code in PR #5790:
URL: https://github.com/apache/arrow-datafusion/pull/5790#discussion_r1155734134
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datafusion/core/src/physical_plan/file_format/file_stream.rs:
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@@ -232,23 +223,20 @@ impl<F: FileOpener> FileStream<F> {
fn poll_inner(&mut self, cx: &mut Context<'_>) ->
Poll<Option<Result<RecordBatch>>> {
loop {
match &mut self.state {
- FileStreamState::Idle => {
- self.file_stream_metrics.time_opening.start();
-
- match self.start_next_file().transpose() {
- Ok(Some((future, partition_values))) => {
- self.state = FileStreamState::Open {
- future,
- partition_values,
- }
- }
- Ok(None) => return Poll::Ready(None),
- Err(e) => {
- self.state = FileStreamState::Error;
- return Poll::Ready(Some(Err(e)));
+ FileStreamState::Idle => match
self.start_next_file().transpose() {
+ Ok(Some((future, partition_values))) => {
+ self.file_stream_metrics.time_opening.start();
Review Comment:
I think we want this call before `self.start_next_file`. In some cases (for
example, when reading from the `LocalFileSystem` store outside of a Tokio
context) this can block and we would not capture the time spent on disk IO.
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