jayzhan211 commented on code in PR #15822:
URL: https://github.com/apache/datafusion/pull/15822#discussion_r2058019883
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datafusion/physical-optimizer/src/enforce_sorting/replace_with_order_preserving_variants.rs:
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@@ -138,6 +138,21 @@ fn plan_with_order_preserving_variants(
} else if is_coalesce_partitions(&sort_input.plan) && is_spm_better {
let child = &sort_input.children[0].plan;
if let Some(ordering) = child.output_ordering() {
+ let mut fetch = fetch;
+ if let Some(coalesce_fetch) = sort_input.plan.fetch() {
+ if let Some(sort_fetch) = fetch {
+ if coalesce_fetch < sort_fetch {
+ return Err(
+ DataFusionError::Internal(
Review Comment:
nit: `internal_err!`
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