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help / color / mirror / Atom feedFrom: Alexander Korotkov <akorotkov@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Reject degenerate SPLIT PARTITION with DEFAULT partition
Date: Wed, 20 May 2026 11:45:51 +0000
Message-ID: <E1wPfN1-000OT2-26@gemulon.postgresql.org> (raw)
Reject degenerate SPLIT PARTITION with DEFAULT partition
ALTER TABLE ... SPLIT PARTITION allows a DEFAULT partition to be created
as one of the replacement partitions when the parent table does not
already have one. However, it should not allow the degenerate case where
a non-DEFAULT partition keeps exactly the same bound as the split
partition and the command merely adds a DEFAULT partition through the
SPLIT PARTITION path.
Detect that case by comparing the bound of the split partition with the
bound of the only non-DEFAULT replacement partition, and raise an error
when they are the same. Users should add a DEFAULT partition directly
with CREATE TABLE ... PARTITION OF ... DEFAULT or ALTER TABLE ... ATTACH
PARTITION ... DEFAULT instead.
Author: Chao Li <lic@highgo.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Discussion: https://postgr.es/m/C18878AB-DEB2-4A61-9995-A035DD644B81@gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/d8af73010033cb8ad6c941942d6b03d74d7e4f7e
Modified Files
--------------
src/backend/partitioning/partbounds.c | 150 ++++++++++++++++++++++++++
src/test/regress/expected/partition_split.out | 59 ++++++++++
src/test/regress/sql/partition_split.sql | 52 +++++++++
3 files changed, 261 insertions(+)
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To: pgsql-committers@postgresql.org
Cc: akorotkov@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Reject degenerate SPLIT PARTITION with DEFAULT partition
In-Reply-To: <E1wPfN1-000OT2-26@gemulon.postgresql.org>
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