[postgis-devel] Transparent GiST indexing support ?

[Paul Ramsey]

It doesn't seem like it:

create type pseudobox as ( minx real, miny real, maxx real, maxy real );
create table boxtest ( bb pseudobox ) ;
insert into boxtest values ( '(0, 0, 1, 1)' );
create function pseudo2box ( pseudobox ) returns box2d language sql  
immutable as
'select (''BOX('' || ($1).minx || '' '' || ($1).miny || '','' ||  
($1).maxx || '' '' || ($1).maxy || '')'')::box2d';
create cast ( pseudobox as box2d) with function pseudo2box(pseudobox);
select bb::box2d from boxtest;

pramsey=# create index bboxtest_idx on boxtest using gist ( bb  
gist_geometry_ops );
ERROR:  operator class "gist_geometry_ops" does not accept data type  
pseudobox
pramsey=# create index bboxtest_idx on boxtest using gist  
( pseudo2box(bb) gist_geometry_ops );
ERROR:  operator class "gist_geometry_ops" does not accept data type  
box2d
pramsey=# create index bboxtest_idx on boxtest using gist  
( geometry(pseudo2box(bb))
CREATE INDEX



On Jan 12, 2009, at 8:30 AM, strk wrote:

> (Context: WKTRaster project)
>
> Out of the box, can the currently min-required postgres
> version provide transparent GiST support for a RASTER type
> by means of implicit casts to some of the BOX* types ?
>
> TIA
>
> --strk;
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--
Paul Ramsey
pramsey at cleverelephant.ca
+1 250 885 0632