From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Chris Bitmead <chris(at)bitmead(dot)com> |
Cc: | Postgres Hackers List <hackers(at)postgreSQL(dot)org> |
Subject: | Re: Backend Question |
Date: | 2000-07-03 14:31:49 |
Message-ID: | 19056.962634709@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Chris Bitmead <chris(at)bitmead(dot)com> writes:
> Can anyone tell me what the concept of a "group" is in
> backend/libpq/portal.c? There are functions like PQntuplesGroup,
> PQfnumberGroup, PQfsizeGroup, PQftypeGroup etc etc.
Once upon a time it probably supported something like the ability to
merge tuples of different types into a SELECT result. It does not
now: a little scanning shows there is no way to get no_groups above 1
in the current logic.
You should realize, however, that all that backend-PQexec code is dead
code and has been for a long time. It's unlikely that it works at all
any more, considering all the changes that have gone on while it sits
untested on the sidelines. I proposed ripping it out a few months ago,
and no one objected ... but I haven't got round to it yet.
regards, tom lane
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