adriangb commented on code in PR #16641:
URL: https://github.com/apache/datafusion/pull/16641#discussion_r2179833468
##########
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:
Yeah my guess is that you can push down a sort below any operator that
preserves order but you can't push down a a limit below any operator that
changes the cardinality of the data. I'm surprised we can push TopK down
through a HashJoin.
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