ion-elgreco commented on issue #5882:
URL: https://github.com/apache/arrow-rs/issues/5882#issuecomment-2288634562
I got a bit confused myself here, but @thomasfrederikhoeck you have issues
during Optimize where the data is being read differently. @tustvold, here it
seems read a Parquet object within a tokio task, should this be rayon
threadpool instead?
```rust
let stream = match operations {
OptimizeOperations::Compact(bins) => futures::stream::iter(bins)
.flat_map(|(_, (partition, bins))| {
futures::stream::iter(bins).map(move |bin|
(partition.clone(), bin))
})
.map(|(partition, files)| {
debug!(
"merging a group of {} files in partition {:?}",
files.len(),
partition,
);
for file in files.iter() {
debug!(" file {}", file.location);
}
let object_store_ref = log_store.object_store();
let batch_stream = futures::stream::iter(files.clone())
.then(move |file| {
let object_store_ref = object_store_ref.clone();
async move {
let file_reader =
ParquetObjectReader::new(object_store_ref, file);
ParquetRecordBatchStreamBuilder::new(file_reader)
.await?
.build()
}
})
.try_flatten()
.boxed();
let rewrite_result =
tokio::task::spawn(Self::rewrite_files(
self.task_parameters.clone(),
partition,
files,
log_store.object_store().clone(),
futures::future::ready(Ok(batch_stream)),
));
util::flatten_join_error(rewrite_result)
})
.boxed(),
```
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