Feedback-ID: i76984098:Fastmail
Message-ID: <295e06b4-ff5d-4d82-ba56-1bab24be6bbc@aklaver.com>
Date: Tue, 18 Mar 2025 11:41:39 -0700
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: After upgrading libpq, the same function(PQftype) call returns a
 different OID
To: Sebastien Flaesch <sebastien.flaesch@4js.com>,
 Tom Lane <tgl@sss.pgh.pa.us>,
 M Tarkeshwar Rao <m.tarkeshwar.rao@ericsson.com>
Cc: "pgsql-general@postgresql.org" <pgsql-general@postgresql.org>
References: <PAWPR07MB1009569596278D85AC691BBF4AEDD2@PAWPR07MB10095.eurprd07.prod.outlook.com>
 <3498256.1742065328@sss.pgh.pa.us>
 <DBAP191MB1289124F5D8690DF3F72F62CB0DC2@DBAP191MB1289.EURP191.PROD.OUTLOOK.COM>
Content-Language: en-US
From: Adrian Klaver <adrian.klaver@aklaver.com>
In-Reply-To: <DBAP191MB1289124F5D8690DF3F72F62CB0DC2@DBAP191MB1289.EURP191.PROD.OUTLOOK.COM>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Archived-At: <https://www.postgresql.org/message-id/295e06b4-ff5d-4d82-ba56-1bab24be6bbc%40aklaver.com>
Precedence: bulk

On 3/16/25 02:30, Sebastien Flaesch wrote:
> 
> Hello,
> 
> I think the column type identification with PQftype() needs some 
> review/clarification.
> 
> It's a pity that libpq does not have an API to return directly the 
> actual type name of a column.
> 
> The doc 
> <https://www.postgresql.org/docs/17/libpq-exec.html#LIBPQ-PQFTYPE> says:
> 
> You can query the system table |pg_type| to obtain the names and 
> properties of the various data types. *The OIDs of the built-in data 
> types are defined in the file |catalog/pg_type_d.h| in the 
> PostgreSQL installation's |include| directory.*
> 
> After building PostgreSQL *17.4* from the sources, I cannot find this 
> pg_type_d.h header file in the installation directory. Maybe I am 
> missing some configure option?

Went I built from source in ended up in:

/usr/local/pgsql/include/server/catalog/


-- 
Adrian Klaver
adrian.klaver@aklaver.com