On 10 May 2010, at 20:06, Greg Stark wrote:
> On Sun, May 9, 2010 at 4:47 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Ovid <curtis_ovid_poe@yahoo.com> writes:
>>> My apologies. This isn't PG-specific, but since this is running on PostgreSQL 8.4, maybe there are specific
featureswhich might help.
>>> I have a tree structure in a table and it uses materialized paths to allow me to find children quickly. However, I
alsoneed to sort the results depth-first, as one would expect with threaded forum replies.
>>
>> I think contrib/ltree might help you here. However, it seems to sort
>> node names textually rather than numerically, so you might need to
>> change it a bit for your own purposes.
>>
>
> That's rather unfortunate. Ltree is awfully convenient and it would be
> nice to be able to use it.
>
> If you just used plain Postgres arrays of integers you would get the
> sorting you want. But you lose all the useful ltree operators for
> trees.
I recall from the docs that you can create arrays of ltrees. It has some special operators for that. I couldn't figure
outwhat the use case for those ltree-arrays was (the docs are rather sparse), but it might just be what you're looking
for.
Alban Hertroys
--
Screwing up is an excellent way to attach something to the ceiling.
!DSPAM:737,4be8791c10411720337464!
