MIME-Version: 1.0
References: 
 <CA+mi_8Zdk_beGcbOjkpdo+fchTR5ot1XM2zZc=ujSGqP+WVh-g@mail.gmail.com>
 <2b9859f0-0964-2baa-b6bc-13f975ae0f67@aklaver.com>
 <CA+mi_8ZfV+rEDKaqM-pcSf43FuN4FUJGoGTxvEEXap-x_GWP0Q@mail.gmail.com>
 <88fb7a7e-a182-a816-c1a7-8a1f54b65215@aklaver.com>
 <CA+mi_8YUEPfTPqD-1Jxm6NUwgJpWxPgejRZ+2-mPQr=0DQWiHA@mail.gmail.com>
 <4830fb8d-fa57-e0f8-0e4f-a96ed040dede@dndg.it>
 <CA+mi_8a+Q0C2LwiedwNkRPVY=-G3q0zW6w19zYvvADtdEd4b_w@mail.gmail.com>
 <1546497c-ff41-9bd0-b4d7-931bd305caac@dndg.it>
 <CAMqTPqkac5xa=+kwKLj8DEr9OdrkJpEzJj4Re8VvKP=JeTdZog@mail.gmail.com>
 <CA+mi_8aRQBG+Lz12oW0Be62RSR7UEEoev5Yn34ZSygcOgxbOCw@mail.gmail.com>
 <9989BCEF-2CC4-4AA4-9E4E-C83740F21414@thebuild.com>
In-Reply-To: <9989BCEF-2CC4-4AA4-9E4E-C83740F21414@thebuild.com>
From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Tue, 10 Nov 2020 03:43:29 +0000
Message-ID: 
 <CA+mi_8aWb9avqTtm=MZcNzUVvKvvWYS7BzcuCapgA9wnNFRyGQ@mail.gmail.com>
Subject: Re: psycopg3 and adaptation choices
To: Christophe Pettus <xof@thebuild.com>
Cc: Vladimir Ryabtsev <greatvovan@gmail.com>,
 Federico Di Gregorio <fog@dndg.it>, psycopg@lists.postgresql.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Tue, 10 Nov 2020 at 03:22, Christophe Pettus <xof@thebuild.com> wrote:
>
> > On Nov 9, 2020, at 19:20, Daniele Varrazzo <daniele.varrazzo@gmail.com> wrote:
> >
> >    Choices to cast Python ``int`` type:
>
> Is it absurd to make the choice at execution time, based on the actual value of the Python int?

I've been thinking a lot about it. I haven't completely ruled it out,
but there are a few cases in which having different oids for the same
query gets in the way. One that comes to mind is with prepared
statements, either explicit (which I haven't exposed yet, but it's
like the #1 request for a new feature), or implicit (currently using
them to implement 'executemany()'). However I might be overestimating
these issues, yes.

I guess I should give an overview of the whole adaptation system: I'll
try and write its documentation in the next few days. I have to start
with the documentation somewhere...

-- Daniele