Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

10.04.2024 12:00, Alexander Lakhin wrote:
> Hello Alexander and Dmitry,
>
> 10.04.2024 02:03, Alexander Korotkov wrote:
>> Thank you.  I've pushed this fix with minor corrections from me.
>

Please look at another anomaly with MERGE.

CREATE TEMP TABLE t (i int) PARTITION BY RANGE (i);
CREATE TABLE tp_0_2 PARTITION OF t
  FOR VALUES FROM (0) TO (2);
fails with
ERROR:  cannot create a permanent relation as partition of temporary relation "t"

But
CREATE TEMP TABLE t (i int) PARTITION BY RANGE (i);
CREATE TEMP TABLE tp_0_1 PARTITION OF t
  FOR VALUES FROM (0) TO (1);
CREATE TEMP TABLE tp_1_2 PARTITION OF t
  FOR VALUES FROM (1) TO (2);
ALTER TABLE t MERGE PARTITIONS (tp_0_1, tp_1_2) INTO tp_0_2;
succeeds and we get:
regression=# \d+ t*
                                    Partitioned table "pg_temp_1.t"
 Column |  Type   | Collation | Nullable | Default | Storage | Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
 i      | integer |           |          |         | plain |             |              |
Partition key: RANGE (i)
Partitions: tp_0_2 FOR VALUES FROM (0) TO (2)

                                         Table "public.tp_0_2"
 Column |  Type   | Collation | Nullable | Default | Storage | Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
 i      | integer |           |          |         | plain |             |              |
Partition of: t FOR VALUES FROM (0) TO (2)
Partition constraint: ((i IS NOT NULL) AND (i >= 0) AND (i < 2))

Best regards,
Alexander