alamb commented on code in PR #21449:
URL: https://github.com/apache/datafusion/pull/21449#discussion_r3057460004


##########
docs/source/library-user-guide/upgrading/53.0.0.md:
##########
@@ -125,6 +151,16 @@ let sub_plan = self.query_to_plan(subquery, 
planner_context)?;
 planner_context.pop_outer_query_schema();
 ```
 
+### `HashJoinExec::try_new` adds `null_aware`
+
+`HashJoinExec::try_new` now takes an extra `null_aware: bool` argument. This
+flag is used for null-aware anti joins, such as plans generated for `NOT IN`
+subqueries.
+
+Most callers should pass `false`. Pass `true` only for null-aware
+`JoinType::LeftAnti` joins. DataFusion validates that null-aware joins are
+single-column `LeftAnti` joins.

Review Comment:
   Done in 20be4a6f343b8498ef30070e9f2d5b583038f7f4



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