Message-ID: <dbc8b96c-3cf0-d1ee-860d-0e491da20485@gmail.com>
Date: Wed, 10 Apr 2024 15:00:00 +0300
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Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
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From: Alexander Lakhin <exclusion@gmail.com>
To: Alexander Korotkov <aekorotkov@gmail.com>,
 Dmitry Koval <d.koval@postgrespro.ru>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Richard Guo <guofenglinux@gmail.com>
References: <c73a1746-0cd0-6bdd-6b23-3ae0b7c0c582@postgrespro.ru>
 <171085360143.2046436.7217841141682511557.pgcf@coridan.postgresql.org>
 <171085858750.2046434.12246066729700037354.pgcf@coridan.postgresql.org>
 <909e16b4-9eda-435c-b033-8294ae4adc05@postgrespro.ru>
 <CAPpHfdsVQwnZPxaQPwcu1g_01F0d-o=ECRcf14X3CmavJB6vSQ@mail.gmail.com>
 <a83d5a56-ff33-47e8-b2d8-7e9a5d59ee1e@postgrespro.ru>
 <CAPpHfdsCCV8DOv0Ovu4dTSnuWXiEz_AjuW-J6TPj++tcfEGvRw@mail.gmail.com>
 <3a4b9c1c-3edf-4e29-9629-b4113aefb0f3@postgrespro.ru>
 <CAPpHfduNYkMVuUSxZjD6u4tZG6aKdhgQcmhr-K9OQfeg56MNww@mail.gmail.com>
 <c3730d78-6081-4c41-9715-d1d192734576@postgrespro.ru>
 <CAPpHfdtj7YsPaASoVPN+N3H4_Ct+kQw8QY1d_9u7FPnbghkicw@mail.gmail.com>
 <CAHewXNkGMPU50QG7V6Q60JGFORfo8LfYO1_GCkCa0VWbmB-fEw@mail.gmail.com>
 <28ed1ee0-749d-9838-955e-abff42fc44be@gmail.com>
 <ce654fca-74cf-44fb-a7e6-d35e3718179c@postgrespro.ru>
 <CAPpHfdtTgSdbzfcEz_mgVxh8VSDP=VfQ6r4T1n9SMT_impbDiA@mail.gmail.com>
 <b56918c2-b099-9875-aa4e-8fd405cdb6ab@gmail.com>
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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