Re: WIP patch: add (PRE|POST)PROCESSOR options to COPY

Andrew Dunstan <andrew@dunslane.net> writes:
> On 11/14/2012 11:39 AM, Tom Lane wrote:
>> What happened to the previous proposal of treating the COPY
>> target as a pipe specification, ie

> I'd like to be able to filter STDIN if possible - with this syntax how 
> is COPY going to know to hook up STDIN to the program?

Huh?  That's fairly nonsensical for the backend-side case; there's no
way that stdin (or stdout) of a backend is going to connect anywhere
useful for this purpose.  As for doing it on the psql side (\copy),
I think it would be more or less automatic.  If you do say
foo | psql -c "\copy tab from 'bar |'" dbname

then bar is going to inherit psql's stdin, which is coming from foo.
        regards, tom lane