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 <CAJTYsWUzok2+mvSYkbVUwq_SWWg-GdHqCuYumN82AU97SjwjCA@mail.gmail.com>
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 <CAJTYsWUzok2+mvSYkbVUwq_SWWg-GdHqCuYumN82AU97SjwjCA@mail.gmail.com>
From: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Date: Sun, 8 Mar 2026 01:13:13 +0530
Message-ID: 
 <CAJTYsWVK6rw++WU94=gFk5ZR5ZXhT3BYOFxhm6tT9xOGG-drnA@mail.gmail.com>
Subject: Re: tid_blockno() and tid_offset() accessor functions
To: pgsql-hackers@postgresql.org
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Hello,

Attaching a V2-patch post rebasing due to oid conflict with the latest main
branch. In addition to that changing the sql function name for tid block
number to tid_block and adding document related changes.

Please review and let me know your thoughts.

Regards,
Ayush

On Sat, 28 Feb 2026 at 00:29, Ayush Tiwari <ayushtiwari.slg01@gmail.com>
wrote:

> Hi hackers,
>
> As of now we don't have any built-in way to extract the block and offset
> components from a TID. When people need to group by page (like for bloat
> analysis) or filter by specific blocks, they usually end up using the
> `ctid::text::point` hack:
>
>     SELECT (ctid::text::point)[0]::bigint AS blockno,
>            (ctid::text::point)[1]::int    AS offset
>     FROM my_table;
>
> This works, but it's pretty clunky, relies on the text representation, and
> isn't great if you're trying to parse TIDs outside of SQL.
>
> The attached patch adds two simple accessor functions:
> - `tid_blockno(tid) -> bigint`
> - `tid_offset(tid) -> integer`
>
> A couple of quick notes on the implementation I went for:
> - `tid_blockno` returns `int8` since `BlockNumber` is `uint32` and could
> overflow `int4`.
> - `tid_offset` returns `int4` since `OffsetNumber` is `uint16`.
> - Both are marked leakproof and strict.
> - I used the `NoCheck` macros from `itemptr.h` so they safely handle
> user-supplied literals like `(0,0)`.
>
> Please let me know what you think!
>
> Regards,
> Ayush
>

--000000000000109d2b064c7462b3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<br><br>Attaching a V2-patch post rebasing due to oi=
d conflict with the latest main branch. In addition to that changing the sq=
l function name for tid block number to tid_block and adding document relat=
ed changes.<br><br>Please=C2=A0review and let me know your thoughts.<br><br=
>Regards,<br>Ayush</div><br><div class=3D"gmail_quote gmail_quote_container=
"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, 28 Feb 2026 at 00:29, Ayush=
 Tiwari &lt;<a href=3D"mailto:ayushtiwari.slg01@gmail.com">ayushtiwari.slg0=
1@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div dir=3D"ltr">Hi hackers,<br><br>As of now we don&#39;t have =
any built-in way to extract the block and offset components from a TID. Whe=
n people need to group by page (like for bloat analysis) or filter by speci=
fic blocks, they usually end up using the `ctid::text::point` hack:<br><br>=
=C2=A0 =C2=A0 SELECT (ctid::text::point)[0]::bigint AS blockno,<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(ctid::text::point)[1]::int =C2=A0 =C2=A0=
AS offset<br>=C2=A0 =C2=A0 FROM my_table;<br><br>This works, but it&#39;s p=
retty clunky, relies on the text representation, and isn&#39;t great if you=
&#39;re trying to parse TIDs outside of SQL.<br><br>The attached patch adds=
 two simple accessor functions:<br>- `tid_blockno(tid) -&gt; bigint`<br>- `=
tid_offset(tid) -&gt; integer`<br><br>A couple of quick notes on the implem=
entation I went for:<br>- `tid_blockno` returns `int8` since `BlockNumber` =
is `uint32` and could overflow `int4`.<br>- `tid_offset` returns `int4` sin=
ce `OffsetNumber` is `uint16`.<br>- Both are marked leakproof and strict.<b=
r>- I used the `NoCheck` macros from `itemptr.h` so they safely handle user=
-supplied literals like `(0,0)`.<br><br>Please let me know what you think!<=
br><br>Regards,<br>Ayush</div>
</blockquote></div>

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