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From: Vinícius Abrahão <[email protected]>
To: [email protected]
Subject: Re: Userland copy of pg_statistic - is there a solution?
Date: Thu, 3 Oct 2024 12:29:50 +0100
Message-ID: <CAM9BftyjEyMyy6qHfMUTzaKH6XcD2aQB4Wcqiz0TBz3k=DUDag@mail.gmail.com> (raw)
In-Reply-To: <CAM9Bftx6fu1-_qNXTS6T6+VH1F69YzfsMggXGF7JeOzwrOCWLQ@mail.gmail.com>
References: <CAM9Bftx6fu1-_qNXTS6T6+VH1F69YzfsMggXGF7JeOzwrOCWLQ@mail.gmail.com>

On Mon, Sep 30, 2024 at 8:31 AM Vinícius Abrahão <[email protected]>
wrote:

>
> Morning,
>
> postgres=# create table backup_pg_statistic as select * from pg_statistic;
> 2024-09-30 08:25:56 BST [7400]:
> user=vinnix,db=postgres,app=psql,client=[local] ERROR:  column "stavalues1"
> has pseudo-type anyarray
> 2024-09-30 08:25:56 BST [7400]:
> user=vinnix,db=postgres,app=psql,client=[local] STATEMENT:  create table
> backup_pg_statistic as select * from pg_statistic;
> ERROR:  column "stavalues1" has pseudo-type anyarray
> Time: 9.544 ms
> postgres=# create table test_array(a anyarray);
> 2024-09-30 08:26:40 BST [7400]:
> user=vinnix,db=postgres,app=psql,client=[local] ERROR:  column "a" has
> pseudo-type anyarray
> 2024-09-30 08:26:40 BST [7400]:
> user=vinnix,db=postgres,app=psql,client=[local] STATEMENT:  create table
> test_array(a anyarray);
> ERROR:  column "a" has pseudo-type anyarray
> Time: 9.137 ms
> Is there a solution for this simple problem?
>
> Cheers,
> Vinícius
>

Following up my own question - I could overcome this limitation observing
the parameter allow_system_table_mods

postgres=# set allow_system_table_mods to on;
SET
Time: 5.190 ms
postgres=# create table a(a anyarray) ;
CREATE TABLE
Time: 132.959 ms

This is verified at heap_create_with_catalog(...). PostgreSQL code
https://github.com/postgres/postgres/blob/master/src/backend/catalog/heap.c#L1151


If someone needs a patch let me know to make it work for other users. We
can work on this together.

--
vinnix
aka: Vinícius Abrahão Bazana Schmidt
twitter.com/vischmidt

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