postgres - ERROR: operator does not exist

问题

Again, I have a function that works fine locally, but moving it online yields a big fat error... Taking a cue from a response in which someone had pointed out the number of arguments I was passing wasn't accurate, I double-checked in this situation to be certain that I am passing 5 arguments to the function itself...

Query failed: ERROR: operator does not exist: point <@> point HINT: No operator matches the given name and argument type(s). You may need to add explicit type casts.

The query is this:

BEGIN; SELECT zip_proximity_sum('zc',                                                                                                                                                                  
    (SELECT g.lat FROM geocoded g                                                                                                                                                                              
    LEFT JOIN masterfile m ON g.recordid = m.id                                                                                                                                                                
    WHERE m.zip = '10050' ORDER BY m.id LIMIT 1),                                                                                                                                                             
    (SELECT g.lon FROM geocoded g                                                                                                                                                                              
    LEFT JOIN masterfile m ON g.recordid = m.id                                                                                                                                                                
    WHERE m.zip = '10050' ORDER BY m.id LIMIT 1),                                                                                                                                                             
    (SELECT m.zip FROM geocoded g                                                                                                                                                                              
    LEFT JOIN masterfile m ON g.recordid = m.id                                                                                                                                                                
    WHERE m.zip = '10050' ORDER BY m.id LIMIT 1)                                                                                                                                                              
    ,10);

The PG function is this:

CREATE OR REPLACE FUNCTION zip_proximity_sum(refcursor, numeric, numeric, character, numeric)
  RETURNS refcursor AS
$BODY$ 
    BEGIN 

        OPEN $1 FOR 
            SELECT r.zip, point($2,$3) <@> point(g.lat, g.lon) AS distance
            FROM
            geocoded g LEFT JOIN masterfile r ON g.recordid = r.id 
            WHERE (geo_distance( point($2,$3),point(g.lat,g.lon)) < $5)
            ORDER BY r.zip, distance;
        RETURN $1; 
    END; 
    $BODY$
  LANGUAGE 'plpgsql' VOLATILE
  COST 100;

回答1:

Here are the exact commands:

create extension cube;
create extension earthdistance;
select (point(-0.1277,51.5073) <@> point(-74.006,40.7144)) as distance;

     distance     
------------------
 3461.10547602474
(1 row)

Note that points are created with LONGITUDE FIRST. Per the documentation:

Points are taken as (longitude, latitude) and not vice versa because longitude is closer to the intuitive idea of x-axis and latitude to y-axis.

Which is terrible design... but that's the way it is.

回答2:

The <@> operator is provided by earthdistance extension. You need to call create extension earthdistance; on production database.

More info about Earthdistance: http://www.postgresql.org/docs/9.1/static/earthdistance.html
Checking available extensions: http://www.postgresql.org/docs/9.1/static/view-pg-available-extensions.html

回答3:

Are you sure that postgis was properly installed on the online server?

回答4:

The point of error is the select statement in your stored procedure:

SELECT r.zip, point($2,$3) <@> point(g.lat, g.lon) AS distance
                            ^

At the marked position an operator is expected, but your operator is either not defined or has other argumet types. Postgres itself only knows of the <@ and @> containment operators. Look here for their explanation.

Can you please elaborate on what you are trying to achieve.

来源：https://stackoverflow.com/questions/2665786/postgres-error-operator-does-not-exist

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postgresql

PostGIS