Re: Make COPY format extendable: Extract COPY TO format implementations

On Wed, Dec 6, 2023 at 10:45 AM Sutou Kouhei <kou@clear-code.com> wrote:
>
> Hi,
>
> Thanks for replying to this proposal!
>
> In <20231205182458.GC2757816@nathanxps13>
>   "Re: Make COPY format extendable: Extract COPY TO format implementations" on Tue, 5 Dec 2023 12:24:58 -0600,
>   Nathan Bossart <nathandbossart@gmail.com> wrote:
>
> > I think it makes sense to do this part independently, but we should be
> > careful to design this with the follow-up tasks in mind.
>
> OK. I'll keep updating the "TODOs" section in the original
> e-mail. It also includes design in the follow-up tasks. We
> can discuss the design separately from the patches
> submitting. (The current submitted patch just focuses on
> refactoring but we can discuss the final design.)
>
> > I assume the performance concerns stem from the use of
> > function pointers.  Or was there something else?
>
> I think so too.
>
> The original e-mail that mentioned the performance concern
> [1] didn't say about the reason but the use of function
> pointers might be concerned.
>
> If the currently supported formats ("text", "csv" and
> "binary") are implemented as an extension, it may have more
> concerns but we will keep them as built-in formats for
> compatibility. So I think that no more concerns exist for
> these formats.
>

For the modern formats(parquet, orc, avro, etc.), will they be
implemented as extensions or in core?

The patch looks good except for a pair of extra curly braces.

>
> [1]: https://www.postgresql.org/message-id/flat/3741749.1655952719%40sss.pgh.pa.us#2bb7af4a3d2c7669f9a49808d777a20d
>
>
> Thanks,
> --
> kou
>
>


--
Regards
Junwang Zhao