[postgis-users] Cascaded Union Aggregate function

[Paragon Corporation]

Dane,
Dane,
Oops sorry about that .  I just posted a revised version.  Can you try that
out?  Thanks.

Also can you send me a sample of your data off list.  I think the issue was
I was experimenting with array_append vs. st_geom_accum and I had gotten the
error you described below, but then was unable to replicate it again.

It could be the detoasting affect of st_geom_accum that Mark had described
was the difference between the two. 

Thanks,
Regina

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Dane
Springmeyer
Sent: Sunday, October 05, 2008 1:47 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Cascaded Union Aggregate function

Hi Regina,

Thank you so much for the wiki posting. I've been using your code from your
august 12th email with great success, if not joy. What an amazing speed
improvement, especially for such a critical function. This was your exact
email of code I have working:
http://postgis.refractions.net/pipermail/postgis-devel/2008-August/003412.ht
ml

I've just downloaded the new code off the wiki, but I'm getting an error of
'Unknown Geometry Type: 0'. I'll paste the whole error below in case you
have an idea what might be going on. I'm running mac 10.5 with these
details:

             postgis_version
---------------------------------------
  1.3 USE_GEOS=1 USE_PROJ=1 USE_STATS=1
(1 row)

--------------------------------------------------------------
  PostgreSQL 8.3.3 on i386-apple-darwin9.4.0, compiled by GCC


Cheers,

Dane


-- full error:
test=# select upgis_cascadeunion(the_geom) from npsa group by wholedrain;

ERROR:  Unknown geometry type: 0
CONTEXT:  SQL function "upgis_dump_collect_garray" statement 1
SQL statement "SELECT   
upgis_dump_collect_garray( array_append(ARRAY(SELECT  $1 [s] As geom FROM
generate_series(1,  $2 ) As s WHERE NOT (s = ANY( $3 )) ),  
st_unite_garray(ARRAY(SELECT  $1 [s] As geom FROM generate_series(1,   
$2 ) As s WHERE s = ANY( $3 ) ) ) ) )"
PL/pgSQL function "st_collect_unite_garray" line 29 at assignment SQL
statement "SELECT  upgis_unitecascade_garray(ARRAY(SELECT
st_collect_unite_garray( $1 [i:least(i +  $2  - 1, $3 )]) As geom FROM
generate_series(1,  $3 , $2 ) As i),  $4  + 1,  $5 , false)"
PL/pgSQL function "upgis_unitecascade_garray" line 48 at assignment
SQL statement "SELECT   
upgis_dump_collect_garray( array_append(ARRAY(SELECT  $1 [ $2 [s]] As geom
FROM generate_series(1, array_upper( $2 ,1)) As s ),
upgis_unitecascade_garray(ARRAY(SELECT  $1 [s] As geom FROM  
generate_series(1,  $3 ) As s WHERE NOT (s = ANY( $2 )) ),  $4  + 1,   
$5 , true) ) )"
PL/pgSQL function "upgis_unitecascade_garray" line 33 at assignment SQL
function "upgis_unitecascade_garray_sort" statement 1


On Oct 4, 2008, at 4:53 PM, Paragon Corporation wrote:

>
> Oops sorry about that.
>
> Just realized I had ugly spaces in the link.  I've changed it.  Use 
> this one
>
> http://postgis.refractions.net/support/wiki/index.php?upgis_cascadeuni
> on
>
> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of 
> Paragon Corporation
> Sent: Saturday, October 04, 2008 7:44 PM
> To: 'PostGIS Users Discussion'
> Subject: [postgis-users] Cascaded Union Aggregate function
>
> For those people who have unions to do that are slow, feel free to try 
> out this aggregate union function.
>
> I haven't tested it enough for it to make it into 1.3.4, but have 
> included a link to the source code in the wiki.  It should work just 
> fine on PostGIS versions 1.2.2 and above.
>
> http://postgis.refractions.net/support/wiki/index.php?PL%2FPGSQL%20Pse
> udo%20 Cascade%20Union%20Aggregate%20Function
>
> Let me know if you run into any problems with it.  It has worked well 
> for the samples I have used it on.
>
> Thanks,
> Regina
>
>
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