> Hello!
>
>
> Is there a way to index a point field? The obvious method didn't work
> for me:
> mark=> create index lon_lat_idx on zip (lon_lat);
> ERROR: Can't find a default operator class for type 600
It is true that there is no default opclass for point. As a matter of
fact, there is no opclass for defined for point at all. You can try
box_ops, though:
create table zip (lon_lat point);
insert into zip values('120,47');
insert into zip values('120,48');
insert into zip values('120,49');
insert into zip values('122,47');
insert into zip values('124,60');
create index lon_lat_idx on zip using rtree (lon_lat box_ops);
This seems to work:
test=> select * from zip where lon_lat ~= '120,47';
lon_lat
--------
(120,47)
(1 row)
test=> select * from zip where lon_lat @ '120,45,125,49';
lon_lat
--------
(120,47)
(120,46)
(2 rows)
However, you might want to check it out with a substantial data set
and verify that this index is actually used. If it isn't, I would
simply represent points as boxes.
--Gene
