pg_upgrade failed with ERROR: null relpartbound for relation 18159 error.

Hi,

I am getting ERROR: null relpartbound for relation 18159 while doing
pg_upgrade from v11 to v11/master.

-- user-defined operator class in partition key
CREATE FUNCTION my_int4_sort(int4,int4) RETURNS int LANGUAGE sql
AS $$ SELECT CASE WHEN $1 = $2 THEN 0 WHEN $1 > $2 THEN 1 ELSE -1 END; $$;
CREATE OPERATOR CLASS test_int4_ops FOR TYPE int4 USING btree AS
OPERATOR 1 < (int4,int4), OPERATOR 2 <= (int4,int4),
OPERATOR 3 = (int4,int4), OPERATOR 4 >= (int4,int4),
OPERATOR 5 > (int4,int4), FUNCTION 1 my_int4_sort(int4,int4);
CREATE TABLE partkey_t (a int4) PARTITION BY RANGE (a test_int4_ops);
CREATE TABLE partkey_t_1 PARTITION OF partkey_t FOR VALUES FROM (0) TO
(1000);
INSERT INTO partkey_t VALUES (100);
INSERT INTO partkey_t VALUES (200);

--ran pg_upgrade failed with below error.
pg_restore: creating TABLE "public.partitioned"
pg_restore: creating TABLE "public.partkey_t"
pg_restore: creating TABLE "public.partkey_t_1"
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 485; 1259 18159 TABLE
partkey_t_1 edb
pg_restore: [archiver (db)] could not execute query: ERROR: null
relpartbound for relation 18159
CONTEXT: SQL function "my_int4_sort"
Command was:
-- For binary upgrade, must preserve pg_type oid
SELECT
pg_catalog.binary_upgrade_set_next_pg_type_oid('18161'::pg_catalog.oid);

-- For binary upgrade, must preserve pg_type array oid
SELECT
pg_catalog.binary_upgrade_set_next_array_pg_type_oid('18160'::pg_catalog.oid);

-- For binary upgrade, must preserve pg_class oids
SELECT
pg_catalog.binary_upgrade_set_next_heap_pg_class_oid('18159'::pg_catalog.oid);

CREATE TABLE "public"."partkey_t_1" (
"a" integer
);

-- For binary upgrade, recreate inherited column.
UPDATE pg_catalog.pg_attribute
SET attislocal = false
WHERE attname = 'a'
AND attrelid = '"public"."partkey_t_1"'::pg_catalog.regclass;

-- For binary upgrade, set up inheritance and partitioning this way.
ALTER TABLE ONLY "public"."partkey_t" ATTACH PARTITION
"public"."partkey_t_1" FOR VALUES FROM (0) TO (1000);

-- For binary upgrade, set heap's relfrozenxid and relminmxid
UPDATE pg_catalog.pg_class
SET relfrozenxid = '1915', relminmxid = '1'
WHERE oid = '"public"."partkey_t_1"'::pg_catalog.regclass;

Thanks & Regards,
Rajkumar Raghuwanshi
QMG, EnterpriseDB Corporation