From: Sutou Kouhei <kou@clear-code.com>
To: sawada.mshk@gmail.com
Cc: michael@paquier.xyz
Cc: zhjwpku@gmail.com
Cc: andrew@dunslane.net
Cc: nathandbossart@gmail.com
Cc: pgsql-hackers@postgresql.org
Subject: Re: Make COPY format extendable: Extract COPY TO format implementations
Date: Sun, 10 Dec 2023 05:54:56 +0900 (JST)
Message-ID: <20231210.055456.1961426152912458334.kou@clear-code.com> (raw)
In-Reply-To: <CAD21AoDkoGL6yJ_HjNOg9cU=aAdW8uQ3rSQOeRS0SX85LPPNwQ@mail.gmail.com>
References: <CAEG8a3+rto3btXDK9EON=udnCc7yN7XD4WomyUUO-MiBSeDrEw@mail.gmail.com>
<ZXKm9tmnSPIVrqZz@paquier.xyz>
<CAD21AoDkoGL6yJ_HjNOg9cU=aAdW8uQ3rSQOeRS0SX85LPPNwQ@mail.gmail.com>
Hi,
In <CAD21AoDkoGL6yJ_HjNOg9cU=aAdW8uQ3rSQOeRS0SX85LPPNwQ@mail.gmail.com>
"Re: Make COPY format extendable: Extract COPY TO format implementations" on Fri, 8 Dec 2023 15:42:06 +0900,
Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> So a custom COPY extension would not be able to define SQL functions
> just like arrow(internal) for example. We might need to define a rule
> like the function returning copy_in/out_handler must be defined as
> <method name>_to(internal) and <method_name>_from(internal).
We may not need to add "_to"/"_from" suffix by checking both
of argument type and return type. Because we use different
return type for copy_in/out_handler.
But the current LookupFuncName() family doesn't check return
type. If we use this approach, we need to improve the
current LookupFuncName() family too.
Thanks,
--
kou
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Subject: Re: Make COPY format extendable: Extract COPY TO format implementations
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