Skip site navigation (1) Skip section navigation (2)

Re: selecting from cursor

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alex Pilosov <alex(at)pilosoft(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: selecting from cursor
Date: 2001-07-03 14:02:24
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Alex Pilosov <alex(at)pilosoft(dot)com> writes:
>> And what are you doing with the places that don't care which kind of RTE
>> they are dealing with (which is most of them IIRC)?  While you haven't

> They just have things declared as RangeTblEntry *, and as long as they
> don't access type-specific fields, they are fine.

So you have four (soon to be six or seven) different structs that *must*
have the same fields?  I don't think that's cleaner than a union ...
at the very least, declare it as structs containing RangeTblEntry,
similar to the way the various Plan node types work (see plannodes.h).

> For scrollable cursors, Rescan should be implemented as 'scroll backwards
> until you can't scroll no more', correct?

No, it should be implemented as Rescan.  The portal mechanism needs to
expose the Rescan call for the contained querytree.

			regards, tom lane

In response to


pgsql-hackers by date

Next:From: Tom LaneDate: 2001-07-03 14:12:53
Subject: Re: AW: selecting from cursor
Previous:From: Jean-Francois LevequeDate: 2001-07-03 13:59:01
Subject: Trigger Procedures question

Privacy Policy | About PostgreSQL
Copyright © 1996-2018 The PostgreSQL Global Development Group