From: | jian he <jian(dot)universality(at)gmail(dot)com> |
---|---|
To: | Yugo NAGATA <nagata(at)sraoss(dot)co(dot)jp> |
Cc: | Sergei Kornilov <sk(at)zsrv(dot)org>, 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: | 2024-01-30 06:57:20 |
Message-ID: | CACJufxGpqVg9j_Fb7aBRwricx1ZTV+vEQfUmwuVpNhrRyvcAdA@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Jan 30, 2024 at 1:56 PM Yugo NAGATA <nagata(at)sraoss(dot)co(dot)jp> wrote:
>
> I attached the correct one, v4.
>
+-- Test pg_column_toast_chunk_id:
+-- Check if the returned chunk_id exists in the TOAST table
+CREATE TABLE test_chunk_id (v1 text, v2 text);
+INSERT INTO test_chunk_id VALUES (
+ repeat('0123456789', 10), -- v1: small enough not to be TOASTed
+ repeat('0123456789', 100000)); -- v2: large enough to be TOASTed
select pg_size_pretty(100000::bigint);
return 98kb.
I think this is just too much, maybe I didn't consider the
implications of compression.
Anyway, I refactored the tests, making the toast value size be small.
I aslo refactor the doc.
pg_column_toast_chunk_id entry will be right after pg_column_compression entry.
You can check the screenshot.
Attachment | Content-Type | Size |
---|---|---|
Screenshot from 2024-01-30 14-37-42.png | image/png | 402.0 KB |
v5-0001-introduce-function-pg_column_toast_chunk_id.patch | text/x-patch | 6.5 KB |
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