Re: Adding Support for Copy callback functionality on COPY TO api

From: "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru>
To: "Sanaba, Bilva" <bilvas(at)amazon(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Adding Support for Copy callback functionality on COPY TO api
Date: 2020-09-30 08:48:12
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On 7/2/20 2:41 AM, Sanaba, Bilva wrote:
> Hi hackers,
> Currently, the COPY TO api does not support callback functions, while
> the COPY FROM api does. The COPY TO code does, however, include
> placeholders for supporting callbacks in the future.
> Rounding out the support of callback functions to both could be very
> beneficial for extension development. In particular, supporting
> callbacks for COPY TO will allow developers to utilize the preexisting
> command in order to create tools that give users more support for moving
> data for storage, backup, analytics, etc.
> We are aiming to get the support in core PostgreSQL and add COPY TO
> callback support in the next commitfest.The attached patch contains a
> change to COPY TO api to support callbacks.
Your code almost exactly the same as proposed in [1] as part of 'Fast
COPY FROM' command. But it seems there are differences.


Andrey Lepikhov
Postgres Professional

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