Re: pg_column_toast_chunk_id: a function to get a chunk ID of a TOASTed value

From: jian he <jian(dot)universality(at)gmail(dot)com>
To: Sergei Kornilov <sk(at)zsrv(dot)org>
Cc: Yugo NAGATA <nagata(at)sraoss(dot)co(dot)jp>, Nikita Malakhov <hukutoc(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: pg_column_toast_chunk_id: a function to get a chunk ID of a TOASTed value
Date: 2024-01-02 00:00:00
Message-ID: CACJufxEUcJGsxVmGtdQ+N1SOs7mbZajmNmZHrScWi8ZAm5VnuA@mail.gmail.com
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On Mon, Nov 6, 2023 at 8:00 AM jian he <jian(dot)universality(at)gmail(dot)com> wrote:
>
> minor doc issues.
> Returns the chunk id of the TOASTed value, or NULL if the value is not TOASTed.
> Should it be "chunk_id"?
>
> you may place it after pg_create_logical_replication_slot entry to
> make it look like alphabetical order.
>
> There is no test. maybe we can add following to src/test/regress/sql/misc.sql
> create table val(t text);
> INSERT into val(t) SELECT string_agg(
> chr((ascii('B') + round(random() * 25)) :: integer),'')
> FROM generate_series(1,2500);
> select pg_column_toast_chunk_id(t) is not null from val;
> drop table val;

Hi
the main C function (pg_column_toast_chunk_id) I didn't change.
I added tests as mentioned above.
tests put it on src/test/regress/sql/misc.sql, i hope that's fine.
I placed pg_column_toast_chunk_id in "Table 9.99. Database Object
Location Functions" (below Table 9.98. Database Object Size
Functions).

Attachment Content-Type Size
v2_pg_column_toast_chunk_id (1).patch text/x-patch 3.2 KB

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