Re: ctid ranges

On Wed, Jun 13, 2012 at 3:18 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Wed, Jun 13, 2012 at 03:15:14PM -0500, Merlin Moncure wrote:
>> yeah -- and I think it's a great thing to want to be able to do.  it
>> could be used in parallelizing tricks for example: divide up a table
>> into N approximately equal parts and hand each one off to a work
>> thread.
>
> Can we add this as a TODO?  It would basically be adding
> less/greater-than comparisons for the 'tid' data type.

IMNSHO, it's a no-brainer for the todo (but I think it's more
complicated than adding some comparisons -- which are working now):

postgres=# explain select ctid from foo where ctid >= '(3786,67)'::tid limit 1;
QUERY PLAN
------------------------------------------------------------------
Limit (cost=0.00..0.05 rows=1 width=6)
-> Seq Scan on foo (cost=0.00..16422.00 rows=333333 width=6)
Filter: (ctid >= '(3786,67)'::tid)
(3 rows)

merlin