diff --git a/src/test/regress/expected/partition_join.out b/src/test/regress/expected/partition_join.out
index 4fccd9ae54..f076d15ced 100644
--- a/src/test/regress/expected/partition_join.out
+++ b/src/test/regress/expected/partition_join.out
@@ -1869,3 +1869,35 @@ SELECT t1.a, t1.c, t2.b, t2.c FROM prt1_n t1 FULL JOIN prt1 t2 ON (t1.c = t2.c);
                ->  Seq Scan on prt1_n_p2 t1_1
 (10 rows)
 
+--
+-- No partition-wise join if partitioning collation doesn't match
+--
+CREATE TABLE posix_text (a text) PARTITION BY RANGE (a COLLATE "POSIX");
+CREATE TABLE posix_text1 PARTITION OF posix_text FOR VALUES FROM ('a') TO ('m');
+CREATE TABLE posix_text2 PARTITION OF posix_text FOR VALUES FROM ('m') TO ('z ');
+INSERT INTO posix_text SELECT chr(97 + (i-1)%26::int) FROM generate_series(1, 599) i;
+ANALYZE posix_text;
+CREATE TABLE c_text (a text) PARTITION BY RANGE (a COLLATE "C");
+CREATE TABLE c_text1 PARTITION OF c_text FOR VALUES FROM ('a') TO ('m');
+CREATE TABLE c_text2 PARTITION OF c_text FOR VALUES FROM ('m') TO ('z ');
+INSERT INTO c_text SELECT chr(97 + (i-1)%26::int) FROM generate_series(1, 599) i;
+ANALYZE c_text;
+EXPLAIN (COSTS OFF)
+SELECT p.a, c.a FROM posix_text p JOIN c_text c ON (p.a = c.a) ORDER BY 1;
+                  QUERY PLAN                   
+-----------------------------------------------
+ Merge Join
+   Merge Cond: (p.a = c.a)
+   ->  Sort
+         Sort Key: p.a
+         ->  Append
+               ->  Seq Scan on posix_text1 p
+               ->  Seq Scan on posix_text2 p_1
+   ->  Sort
+         Sort Key: c.a
+         ->  Append
+               ->  Seq Scan on c_text1 c
+               ->  Seq Scan on c_text2 c_1
+(12 rows)
+
+DROP TABLE posix_text, c_text;
diff --git a/src/test/regress/sql/partition_join.sql b/src/test/regress/sql/partition_join.sql
index a2d8b1be55..9dd15c1059 100644
--- a/src/test/regress/sql/partition_join.sql
+++ b/src/test/regress/sql/partition_join.sql
@@ -384,3 +384,23 @@ SELECT t1.a, t1.c, t2.b, t2.c FROM prt1_n t1 JOIN prt2_n t2 ON (t1.c = t2.c) JOI
 -- partitioned table
 EXPLAIN (COSTS OFF)
 SELECT t1.a, t1.c, t2.b, t2.c FROM prt1_n t1 FULL JOIN prt1 t2 ON (t1.c = t2.c);
+
+--
+-- No partition-wise join if partitioning collation doesn't match
+--
+CREATE TABLE posix_text (a text) PARTITION BY RANGE (a COLLATE "POSIX");
+CREATE TABLE posix_text1 PARTITION OF posix_text FOR VALUES FROM ('a') TO ('m');
+CREATE TABLE posix_text2 PARTITION OF posix_text FOR VALUES FROM ('m') TO ('z ');
+INSERT INTO posix_text SELECT chr(97 + (i-1)%26::int) FROM generate_series(1, 599) i;
+ANALYZE posix_text;
+
+CREATE TABLE c_text (a text) PARTITION BY RANGE (a COLLATE "C");
+CREATE TABLE c_text1 PARTITION OF c_text FOR VALUES FROM ('a') TO ('m');
+CREATE TABLE c_text2 PARTITION OF c_text FOR VALUES FROM ('m') TO ('z ');
+INSERT INTO c_text SELECT chr(97 + (i-1)%26::int) FROM generate_series(1, 599) i;
+ANALYZE c_text;
+
+EXPLAIN (COSTS OFF)
+SELECT p.a, c.a FROM posix_text p JOIN c_text c ON (p.a = c.a) ORDER BY 1;
+
+DROP TABLE posix_text, c_text;