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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: Ayush Vatsa <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Issue with pgstattuple on Sequences in PostgreSQL
Date: Mon, 24 Jun 2024 06:35:54 -0700
Message-ID: <CAKFQuwbWg51wrQCNYe8J6V_KXoK5wQR3SERWKhCFwx6jx2OuOw@mail.gmail.com> (raw)
In-Reply-To: <CACX+KaMOd3HHteOJNX7fkWxO+R=uLJkfKqE2-QUK8fKmKfOwqw@mail.gmail.com>
References: <CACX+KaMOd3HHteOJNX7fkWxO+R=uLJkfKqE2-QUK8fKmKfOwqw@mail.gmail.com>
On Monday, June 24, 2024, Ayush Vatsa <[email protected]> wrote:
>
> I was recently exploring the pgstattuple code directory and found this
> piece of code: https://github.com/postgres/postgres/blob/master/contrib/
> pgstattuple/pgstattuple.c#L255-L259.
>
> It indicates that pgstattuple supports relations, toast tables,
> materialized views, and sequences.
> However, when I executed a query with a sequence, I encountered the
> following error:
>
> postgres=> CREATE SEQUENCE serial START 101;
> CREATE SEQUENCE
> postgres=> SELECT * FROM pgstattuple('serial');
> ERROR: only heap AM is supported
> postgres=>
>
> It got stuck in this if condition - https://github.com/postgres/
> postgres/blob/master/contrib/pgstattuple/pgstattuple.c#L326-L329
>
>
> How can one use pgstattuple on sequences?
>
As-is? Doesn’t look like you can. I agree it’s a documentation bug that
this is the case with a brief explanation of why - sequences do not produce
dead tuples and do not behave like real tables aside from being able to be
selected from (i.e., no SQL update/delete command).
The code should produce an explicit error for that relkind as well.
David J.
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To: [email protected]
Cc: [email protected], [email protected], [email protected]
Subject: Re: Issue with pgstattuple on Sequences in PostgreSQL
In-Reply-To: <CAKFQuwbWg51wrQCNYe8J6V_KXoK5wQR3SERWKhCFwx6jx2OuOw@mail.gmail.com>
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