-- oid check
SET enable_seqscan=on;
CREATE TEMPORARY TABLE oidtmp (oid oid);
INSERT INTO oidtmp SELECT g.i::oid FROM generate_series(1, 1000) g(i);
SELECT count(*) FROM oidtmp WHERE oid <  17;
 count 
-------
    16
(1 row)

SELECT count(*) FROM oidtmp WHERE oid <= 17;
 count 
-------
    17
(1 row)

SELECT count(*) FROM oidtmp WHERE oid  = 17;
 count 
-------
     1
(1 row)

SELECT count(*) FROM oidtmp WHERE oid >= 17;
 count 
-------
   984
(1 row)

SELECT count(*) FROM oidtmp WHERE oid >  17;
 count 
-------
   983
(1 row)

CREATE INDEX oididx ON oidtmp USING gist ( oid );
SET enable_seqscan=off;
SELECT count(*) FROM oidtmp WHERE oid <  17;
 count 
-------
    16
(1 row)

SELECT count(*) FROM oidtmp WHERE oid <= 17;
 count 
-------
    17
(1 row)

SELECT count(*) FROM oidtmp WHERE oid  = 17;
 count 
-------
     1
(1 row)

SELECT count(*) FROM oidtmp WHERE oid >= 17;
 count 
-------
   984
(1 row)

SELECT count(*) FROM oidtmp WHERE oid >  17;
 count 
-------
   983
(1 row)