alamb commented on a change in pull request #7958:
URL: https://github.com/apache/arrow/pull/7958#discussion_r470189038
##########
File path: rust/datafusion/src/execution/physical_plan/limit.rs
##########
@@ -81,39 +82,40 @@ struct LimitPartition {
impl Partition for LimitPartition {
fn execute(&self) -> Result<Arc<Mutex<dyn RecordBatchReader + Send +
Sync>>> {
- // collect up to "limit" rows on each partition
- let threads: Vec<JoinHandle<Result<Vec<RecordBatch>>>> = self
+ // apply limit in parallel across all input partitions
+ let local_limit = self
.partitions
.iter()
.map(|p| {
- let p = p.clone();
- let limit = self.limit;
- thread::spawn(move || {
- let it = p.execute()?;
- collect_with_limit(it, limit)
- })
+ Arc::new(LocalLimitExec::new(
Review comment:
Here is what I came up with --
https://issues.apache.org/jira/browse/ARROW-9732 -- I am not quite sure it
captures what you had in mind
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