MIME-Version: 1.0
From: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Date: Sat, 28 Feb 2026 00:29:20 +0530
Message-ID: <CAJTYsWUzok2+mvSYkbVUwq_SWWg-GdHqCuYumN82AU97SjwjCA@mail.gmail.com>
Subject: tid_blockno() and tid_offset() accessor functions
To: pgsql-hackers@postgresql.org
Content-Type: multipart/mixed; boundary="0000000000005be1f4064bd2d6fe"
Archived-At: <https://www.postgresql.org/message-id/CAJTYsWUzok2%2BmvSYkbVUwq_SWWg-GdHqCuYumN82AU97SjwjCA%40mail.gmail.com>
Precedence: bulk

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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

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

<div dir=3D"ltr">Hi hackers,<br><br>As of now we don&#39;t have any built-i=
n way to extract the block and offset components from a TID. When people ne=
ed to group by page (like for bloat analysis) or filter by specific 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=A0AS offset<=
br>=C2=A0 =C2=A0 FROM my_table;<br><br>This works, but it&#39;s pretty clun=
ky, relies on the text representation, and isn&#39;t great if you&#39;re tr=
ying to parse TIDs outside of SQL.<br><br>The attached patch adds two simpl=
e accessor functions:<br>- `tid_blockno(tid) -&gt; bigint`<br>- `tid_offset=
(tid) -&gt; integer`<br><br>A couple of quick notes on the implementation I=
 went for:<br>- `tid_blockno` returns `int8` since `BlockNumber` is `uint32=
` and could overflow `int4`.<br>- `tid_offset` returns `int4` since `Offset=
Number` is `uint16`.<br>- Both are marked leakproof and strict.<br>- 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>Reg=
ards,<br>Ayush</div>

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