Re: [PATCH] Better logging of COPY queries if log_statement='all'

Aleksander Alekseev wrote:

> According to my colleagues it would be very nice to have this feature.
> For instance, if you are trying to optimize PostgreSQL for application
> that uses COPY and you don't have access to or something like this.
> It could also be useful in some other cases.

Outside of the app, what can be already set up is an AFTER INSERT
FOR EACH ROW trigger that essentially does:

raise LOG, '%', NEW;

The main drawback of this approach is that, for each line of data
emitted to the log, there's another STATEMENT: copy... line added.
But that might be not too bad for certain uses.

Ideally we should be able to access the new rowset as a whole through
a statement-level trigger. In that case, the data could be logged in
a one-shot operation by that trigger.
There's a related item in the TODO list:
"Allow statement-level triggers to access modified rows"
and an old thread on -hackers here:
https://www.postgresql.org/message-id/20060522150647.GE24404@svana.org
that discussed this topic in relation to MSSQL having this functionality.

Best regards,
--
Daniel Vérité
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