TinyMurky commented on code in PR #26090:
URL: https://github.com/apache/datafusion/pull/26090#discussion_r4456710204
##########
datafusion/physical-plan/src/joins/sort_merge_join/exec.rs:
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@@ -493,6 +617,18 @@ impl ExecutionPlan for SortMergeJoinExec {
}
fn input_distribution_requirements(&self) -> InputDistributionRequirements
{
+ // Null-aware NOT IN needs facts about the entire right input.
+ // Require a single partition on both sides to use the existing
+ // sort-merge join's partition pairing without cross-partition
coordination.
+ //
+ // TODO: Allow multiple left partitions by sharing the right-side
summary
Review Comment:
I added a new issue #27054 to address the todo.
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