SET client_min_messages = warning;
CREATE EXTENSION IF NOT EXISTS vector;
CREATE TABLE t (val vector(3));
INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
CREATE TABLE t2 (val vector(3));
\copy t TO '/tmp/data.bin' WITH (FORMAT binary)
\copy t2 FROM '/tmp/data.bin' WITH (FORMAT binary)
SELECT * FROM t2 ORDER BY val;
   val   
---------
 [0,0,0]
 [1,1,1]
 [1,2,3]
 
(4 rows)

DROP TABLE t;
DROP TABLE t2;