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In-Reply-To: <884bcf9e-d6e3-4b0c-8dcb-7f2110070ac9@postgrespro.ru>
From: jian he <jian.universality@gmail.com>
Date: Tue, 10 Jun 2025 13:50:12 +0800
Message-ID: 
 <CACJufxHRX6xQtzn+KenK3SDR2+4kUpVnO+0axforV_pohwMnFw@mail.gmail.com>
Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
To: Dmitry Koval <d.koval@postgrespro.ru>
Cc: pgsql-hackers@lists.postgresql.org
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On Tue, Jun 10, 2025 at 6:48=E2=80=AFAM Dmitry Koval <d.koval@postgrespro.r=
u> wrote:
> 3.
>  >i think, we can do the following way:
>  >if (modelRel->rd_rel->relam)
>  >  elog(ERROR, "error");
>  >relamId =3D modelRel->rd_rel->relam;
>
> Can you clarify what is reason to change the current AM-logic for
> creating a new partition?
>
> +       /* Look up the access method for new relation. */
> +       relamId =3D (modelRel->rd_rel->relam !=3D InvalidOid) ?
> modelRel->rd_rel->relam : HEAP_TABLE_AM_OID;
>
> (If AM is set for a partitioned table, then use it, otherwise use AM for
> heap tables.)
>
I only want to allow HEAP_TABLE_AM_OID to be used
in the merge partition,
I guess that would avoid unintended consequences.

I proposed change was
+if (modelRel->rd_rel->relam !=3D HEAP_TABLE_AM_OID)
+   elog(ERROR, "only heap table method is allowed");
+ relamId =3D modelRel->rd_rel->relam;


RangeVarGetAndCheckCreationNamespace
was called first on ATExecMergePartitions, then on createPartitionTable.
Maybe we can pass the first  ATExecMergePartitions call result
to createPartitionTable to avoid calling it twice.


CREATE TABLE pp (a int, b int) PARTITION BY LIST(a);
CREATE TABLE pp_p1 PARTITION OF pp FOR VALUES IN (1, 2);
CREATE TABLE pp_p2 PARTITION OF pp FOR VALUES IN (3, 4);
INSERT INTO pp(a, b) SELECT random(min=3D>1, max=3D>6),
random(min=3D>1::int, max=3D>10) FROM generate_series(0, 4) i;
alter table pp add constraint cc check(a < 0) not valid;

ALTER TABLE pp MERGE PARTITIONS (pp_p1,  pp_p2) INTO pp_p1_2;
src4=3D# \d+ pp_p1_2
                                         Table "public.pp_p1_2"
 Column |  Type   | Collation | Nullable | Default | Storage |
Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------=
+--------------+-------------
 a      | integer |           |          |         | plain   |
    |              |
 b      | integer |           |          |         | plain   |
    |              |
Partition of: pp FOR VALUES IN (1, 2, 3, 4)
Partition constraint: ((a IS NOT NULL) AND (a =3D ANY (ARRAY[1, 2, 3, 4])))
Check constraints:
    "cc" CHECK (a < 0)
Access method: heap

constraint cc on pp_p1_2 should be NOT VALID.
also if the partitioned table has NOT ENFORCED CHECK constraint, it
will cause segfault.
attached is a possible fix, and related tests.(based on v42).


cosmetic changes:
many of the "forach" can change to "foreach_node".
for example in ATExecMergePartitions.
we can change
``foreach(listptr, cmd->partlist)``
to
``foreach_node(RangeVar, name, cmd->partlist)`

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