From: Alexander Korotkov <akorotkov@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Implement ALTER TABLE ... SPLIT PARTITION ... command
Date: Sun, 14 Dec 2025 11:30:02 +0000
Message-ID: <E1vUkIb-000hms-0F@gemulon.postgresql.org> (raw)
Implement ALTER TABLE ... SPLIT PARTITION ... command
This new DDL command splits a single partition into several partitions. Just
like the ALTER TABLE ... MERGE PARTITIONS ... command, new partitions are
created using the createPartitionTable() function with the parent partition
as the template.
This commit comprises a quite naive implementation which works in a single
process and holds the ACCESS EXCLUSIVE LOCK on the parent table during all
the operations, including the tuple routing. This is why the new DDL command
can't be recommended for large, partitioned tables under high load. However,
this implementation comes in handy in certain cases, even as it is. Also, it
could serve as a foundation for future implementations with less locking and
possibly parallelism.
Discussion: https://postgr.es/m/c73a1746-0cd0-6bdd-6b23-3ae0b7c0c582%40postgrespro.ru
Author: Dmitry Koval <d.koval@postgrespro.ru>
Co-authored-by: Alexander Korotkov <aekorotkov@gmail.com>
Co-authored-by: Tender Wang <tndrwang@gmail.com>
Co-authored-by: Richard Guo <guofenglinux@gmail.com>
Co-authored-by: Dagfinn Ilmari Mannsaker <ilmari@ilmari.org>
Co-authored-by: Fujii Masao <masao.fujii@gmail.com>
Co-authored-by: Jian He <jian.universality@gmail.com>
Reviewed-by: Matthias van de Meent <boekewurm+postgres@gmail.com>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Zhihong Yu <zyu@yugabyte.com>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Robert Haas <rhaas@postgresql.org>
Reviewed-by: Stephane Tachoires <stephane.tachoires@gmail.com>
Reviewed-by: Jian He <jian.universality@gmail.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Daniel Gustafsson <dgustafsson@postgresql.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Noah Misch <noah@leadboat.com>
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/4b3d173629f4cd7ab6cd700d1053af5d5c7c9e37
Modified Files
--------------
doc/src/sgml/ddl.sgml | 19 +
doc/src/sgml/ref/alter_table.sgml | 118 +-
src/backend/commands/tablecmds.c | 432 ++++++
src/backend/parser/gram.y | 38 +-
src/backend/parser/parse_utilcmd.c | 197 ++-
src/backend/partitioning/partbounds.c | 737 ++++++++-
src/bin/psql/tab-complete.in.c | 10 +-
src/include/nodes/parsenodes.h | 34 +-
src/include/parser/kwlist.h | 1 +
src/include/partitioning/partbounds.h | 4 +
src/test/isolation/expected/partition-split.out | 230 +++
src/test/isolation/isolation_schedule | 1 +
src/test/isolation/specs/partition-split.spec | 62 +
.../test_ddl_deparse/expected/alter_table.out | 5 +
.../modules/test_ddl_deparse/sql/alter_table.sql | 4 +
.../modules/test_ddl_deparse/test_ddl_deparse.c | 3 +
src/test/regress/expected/partition_split.out | 1592 ++++++++++++++++++++
src/test/regress/parallel_schedule | 2 +-
src/test/regress/sql/partition_split.sql | 1134 ++++++++++++++
src/tools/pgindent/typedefs.list | 2 +
20 files changed, 4585 insertions(+), 40 deletions(-)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-committers@postgresql.org
Cc: akorotkov@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Implement ALTER TABLE ... SPLIT PARTITION ... command
In-Reply-To: <E1vUkIb-000hms-0F@gemulon.postgresql.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox