[BUGS] BUG #14732: partitioned table cann't alter set parallel_workers?

The following bug has been logged on the website:

Bug reference:      14732
Logged by:          Zhou Digoal
Email address:      digoal@126.com
PostgreSQL version: 10beta1
Operating system:   CentOS 6.x x64
Description:

HI,

there is an normal table and a partitiond table.
normal table can set parallel_works parameter, but partitioned table
cann't.

```
postgres=# \d orders                                      Unlogged table "public.orders"    Column      |         Type
       | Collation | Nullable |                Default                   
 
-----------------+-----------------------+-----------+----------+--------------------------------------------o_orderkey
    | bigint                |           | not null | 
nextval('orders_o_orderkey_seq'::regclass)o_custkey       | bigint                |           | not null |
o_orderstatus  | character(1)          |           |          | o_totalprice    | double precision      |           |
      | o_orderdate     | date                  |           |          | o_orderpriority | character(15)         |
    |          | o_clerk         | character(15)         |           |          | o_shippriority  | integer
 |           |          | o_comment       | character varying(79) |           |          | 
 

postgres=# \d orders1                                      Unlogged table "public.orders1"    Column      |
Type         | Collation | Nullable |                 Default                   
 

-----------------+-----------------------+-----------+----------+---------------------------------------------o_orderkey
    | bigint                |           | not null | 
nextval('orders1_o_orderkey_seq'::regclass)o_custkey       | bigint                |           | not null |
o_orderstatus  | character(1)          |           |          | o_totalprice    | double precision      |           |
      | o_orderdate     | date                  |           |          | o_orderpriority | character(15)         |
    |          | o_clerk         | character(15)         |           |          | o_shippriority  | integer
 |           |          | o_comment       | character varying(79) |           |          | 
 
Partition key: RANGE (o_orderdate)
Number of partitions: 84 (Use \d+ to list them.)

postgres=# alter table orders set (parallel_workers =32);
ALTER TABLE
postgres=# alter table orders1 set (parallel_workers =32);
ERROR:  22023: unrecognized parameter "parallel_workers"
LOCATION:  parseRelOptions, reloptions.c:1094
```

but i can update pg_class to modify partitioned table's parallel_works.

```
postgres=# update pg_class set reloptions =array['parallel_workers=13']
where relname ~ 'lineitem' and relkind='r';
UPDATE 85
Time: 11.803 ms
postgres=# explain select count(*) from lineitem1;                                               QUERY PLAN
                                 
 
-----------------------------------------------------------------------------------------------------------Finalize
Aggregate (cost=130579654.20..130579654.21 rows=1 width=8)  ->  Gather  (cost=130579654.16..130579654.17 rows=13
width=8)       Workers Planned: 13        ->  Partial Aggregate  (cost=130579654.16..130579654.17 rows=1 
width=8)              ->  Append  (cost=0.00..130557628.94 rows=8810089 width=0)                    ->  Parallel Seq
Scanon lineitem_ptr_0  
(cost=0.00..209424.27 rows=106127 width=0)                    ->  Parallel Seq Scan on lineitem_ptr_1
(cost=0.00..585852.15 rows=106115 width=0)                    ->  Parallel Seq Scan on lineitem_ptr_2
(cost=0.00..1043031.30 rows=106130 width=0)                    ->  Parallel Seq Scan on lineitem_ptr_3
(cost=0.00..1419621.31 rows=106131 width=0)
...
```

best regards.



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