diff -U3 /Users/admin/pgsql/src/test/regress/expected/join.out /Users/admin/pgsql/build/testrun/recovery/027_stream_regress/data/results/join.out
--- /Users/admin/pgsql/src/test/regress/expected/join.out	2025-02-08 05:36:13
+++ /Users/admin/pgsql/build/testrun/recovery/027_stream_regress/data/results/join.out	2025-02-08 05:39:29
@@ -5966,6 +5966,8 @@
          ->  Seq Scan on c
 (7 rows)
 
+-- check the case when placeholder relates on an outer join and its inner in the
+-- phrels field but actually uses only outer side of the join.
 explain (costs off)
 SELECT q.val FROM b LEFT JOIN (
   SELECT (q1.z IS NOT NULL) AS val