Phoenix500526 commented on code in PR #27256:
URL: https://github.com/apache/datafusion/pull/27256#discussion_r4514320098
##########
datafusion/physical-optimizer/src/join_selection.rs:
##########
@@ -383,6 +388,12 @@ fn hash_join_convert_symmetric_subrule(
hash_join.right.pipeline_behavior(),
EmissionType::Incremental | EmissionType::Both
);
+ if left_unbounded && right_unbounded && hash_join.null_aware {
+ return plan_err!(
+ "Cannot execute a null-aware join with two unbounded inputs: \
+ SymmetricHashJoinExec does not support null-aware semantics."
+ );
+ }
// Process only if both left and right sides are unbounded and
incrementally emit.
if left_unbounded && right_unbounded & left_incremental &
right_incremental {
Review Comment:
Done
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