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In-Reply-To: <9c1b75f1-5c40-4a86-9a61-a4b3f1d7ec60@postgrespro.ru>
From: jian he <jian.universality@gmail.com>
Date: Fri, 13 Jun 2025 14:29:23 +0800
Message-ID: 
 <CACJufxE6mU7Za2X5Z4Cs9jEmgfjTYPy_ChiVXND5ZEZ3xM665g@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 Fri, Jun 13, 2025 at 4:36=E2=80=AFAM Dmitry Koval <d.koval@postgrespro.r=
u> wrote:
>
> Hi, Jian He!
>
> Thanks for the notes and patches (again).
> I read a part of emails, I hope to read the rest emails tomorrow.
>

hi.

in doc/src/sgml/ref/alter_table.sgml
<title>Parameters</title> section,
we also need explain
<replaceable class=3D"parameter">partition_name1</replaceable>
and
<replaceable class=3D"parameter">partition_name2</replaceable>
?


+     <para>
+      This form merges several partitions into the one partition of
the target table.
+      Hash-partitioning is not supported.
maybe we can change to
+    <para>
+   This form merges several partitions of the target table into a new
one partition.
+   Hash-partitioned target table is not supported


+      <para>
+       This command acquires an <literal>ACCESS EXCLUSIVE</literal> lock.
+       This is a significant limitation, which limits the usage of this
+       command with large partitioned tables under a high load.
+      </para>
would be better mentioning that the parent table and to be merged
partition will all take
<literal>ACCESS EXCLUSIVE</literal> lock.
for example, other places we have word like:

     <para>
      Attaching a partition acquires a
      <literal>SHARE UPDATE EXCLUSIVE</literal> lock on the parent table,
      in addition to the <literal>ACCESS EXCLUSIVE</literal> locks on the t=
able
      being attached and on the default partition (if any).
     </para>
---------------------------------------------------------------------------=
------
+        <para>
+         For range- and list-partitioned tables the ranges and lists of va=
lues
+         of the merged partitions can be any.
+        </para>
we can change it to
<para>
For range-partitioned and list-partitioned tables, the partition
bounds specification can be arbitrary.
</para>


+        <para>
+         For range-partitioned tables it is necessary that the ranges
+         of the partitions <replaceable
class=3D"parameter">partition_name1</replaceable>,
+         <replaceable class=3D"parameter">partition_name2</replaceable>
[, ...] can
+         be merged into one range without spaces and overlaps
(otherwise an error
+         will be generated).
"without spaces and overlaps" seems not ideal, I think I found out the
perfect word for it: adjacent.
in [1], we have description like:

anyrange -|- anyrange =E2=86=92 boolean
Are the ranges adjacent?
[1] https://www.postgresql.org/docs/current/functions-range.html
so we can change the above to

For range-partitioned tables, the ranges of the partitions partition_name1,
partition_name2, [...] must be adjacent in order to be merged. Otherwise, a=
n
error will be raised. The resulting combined range will be the new
partition bound for the partition partition_name.

+      The new partition will have the same table access method as the pare=
nt.
+      If the parent table is persistent then the new partition is created
+      persistent.  If the parent table is temporary then the new partition
+      is also created temporary.  The new partition will also be created i=
n
+      the same tablespace as the parent.
+     </para>
we can simplify the above as
" The new partition will inherit the same table access method, persistence
 type, and tablespace as the parent table.
"

+     <para>
+      If merged partitions have different owners, an error will be generat=
ed.
+      The owner of the merged partitions will be the owner of the new
partition.
+      It is the user's responsibility to setup <acronym>ACL</acronym> on t=
he
+      new partition.
+     </para>
I think we also need to mention that individual ACL on the merged
partition will be dropped.

We have function signature
static void RemoveInheritance(Relation child_rel, Relation parent_rel,
bool expect_detached)
I found that "child_rel", "parent_rel" naming improves code
readability a lot for partitioned table contexts.
so we can change
+static void
+detachPartitionTable(Relation partRel, Relation rel, Oid defaultPartOid)
to
+static void
+detachPartitionTable(Relation partRel, Relation rel, Oid defaultPartOid)

We can also rename the ATExecMergePartitions argument (Relation rel)
to (Relation parent_rel), I think it will improve code reliability.

The attached patch is mainly documentation refactoring
and renaming function detachPartitionTable argument,
it is based on v44.

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