xudong963 commented on code in PR #14207:
URL: https://github.com/apache/datafusion/pull/14207#discussion_r1959895206
##########
datafusion/physical-optimizer/src/enforce_distribution.rs:
##########
@@ -1362,6 +1383,21 @@ pub fn ensure_distribution(
plan.with_new_children(children_plans)?
};
+ // If `fetch` was not consumed, it means that there was
`SortPreservingMergeExec` with fetch before
+ // It was removed by `remove_dist_changing_operators`
+ // and we need to add it back.
+ if fetch.is_some() {
+ plan = Arc::new(
+ SortPreservingMergeExec::new(
+ plan.output_ordering()
+ .unwrap_or(&LexOrdering::default())
+ .clone(),
+ plan,
+ )
+ .with_fetch(fetch.take()),
+ )
Review Comment:
And then the `SortPreservingMerge` may be optimized/removed.
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