zhuqi-lucas commented on code in PR #16641:
URL: https://github.com/apache/datafusion/pull/16641#discussion_r2180242562
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datafusion/physical-optimizer/src/enforce_sorting/sort_pushdown.rs:
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@@ -668,6 +668,15 @@ fn handle_hash_join(
plan: &HashJoinExec,
parent_required: OrderingRequirements,
) -> Result<Option<Vec<Option<OrderingRequirements>>>> {
+ // Anti-joins (LeftAnti or RightAnti) do not preserve meaningful input
order,
+ // so sorting beforehand cannot be relied on. Bail out early for both
flavors:
+ match plan.join_type() {
+ JoinType::LeftAnti | JoinType::RightAnti => {
+ return Ok(None);
+ }
+ _ => {}
+ }
Review Comment:
Thank you @adriangb for confirming, addressed it in latest PR.
Now, we will not pushdown Topk for anti join.
But for normal sort without fetch, we should support push down, also added
the related slt testing.
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