Re: [POC] FETCH limited by bytes.

>
>
>> I believe it won't be needed as a regression test but DEBUGn
>> messages could be usable to see "what was sent to the remote
>> side". It can be shown to the console so easily done in
>> regression test. See the deocumentation for client_min_messages
>> for details. (It could receive far many messages then expected,
>> though, and maybe fragile for changing in other part.)
>>
>> regards,
>>
>> --
>> Kyotaro Horiguchi
>> NTT Open Source Software Center
>>
>>
>>
> Ok, I'll see what debug-level messages reveal.
>
>
>
Here's a re-based patch. Notable changes since the last patch are:

- some changes had to move to postgres_fdw.h
- the regression tests are in their own script fetch_size.sql /
fetch_size.out. that should make things easier for the reviewer(s), even if
we later merge it into postgres_fdw.sql/.out.
- I put braces around a multi-line error ereport(). That might be a style
violation, but the statement seemed confusing without it.
- The fetch sql is reported as a DEBUG1 level ereport(), and confirms that
server level options are respected, and table level options are used in
favor of server-level options.

I left the DEBUG1-level message in this patch so that others can see the
output, but I assume we would omit that for production code, with
corresponding deletions from fetch_size.sql and fetch_size.out.