carols10cents commented on code in PR #15030:
URL: https://github.com/apache/datafusion/pull/15030#discussion_r1983674191
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datafusion/physical-plan/src/execution_plan.rs:
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@@ -260,13 +260,30 @@ pub trait ExecutionPlan: Debug + DisplayAs + Send + Sync {
/// used.
/// Thus, [`spawn`] is disallowed, and instead use [`SpawnedTask`].
///
+ /// To enable timely cancellation, the [`Stream`] that is returned must not
+ /// pin the CPU and must yield back to the tokio runtime regularly. This
can
Review Comment:
> What do we mean by "pin the CPU" ?
Doing blocking work in an async task. Do you have a suggestion on different
wording that would be clearer?
> Moreover, returning just Poll::Pending and calling yield_now() does not
exactly do the same thing.
Right, I didn't mean to imply that they did, I was hoping it would come
across as "pick the appropriate one for the particular situation". Would adding
an "(as appropriate)" here address your comment, or do you have a different
suggestion on how to reword this?
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