SET client_min_messages = warning;
CREATE EXTENSION IF NOT EXISTS vector;
SELECT '[1,2,3]'::vector;
 vector  
---------
 [1,2,3]
(1 row)

SELECT '[-1,2,3]'::vector;
  vector  
----------
 [-1,2,3]
(1 row)

SELECT '[hello,1]'::vector;
ERROR:  invalid input syntax for type vector: "hello"
LINE 1: SELECT '[hello,1]'::vector;
               ^
SELECT '[NaN,1]'::vector;
ERROR:  NaN not allowed in vector
LINE 1: SELECT '[NaN,1]'::vector;
               ^
SELECT '[Infinity,1]'::vector;
ERROR:  infinite value not allowed in vector
LINE 1: SELECT '[Infinity,1]'::vector;
               ^
SELECT '[-Infinity,1]'::vector;
ERROR:  infinite value not allowed in vector
LINE 1: SELECT '[-Infinity,1]'::vector;
               ^
SELECT '[1,2,3'::vector;
ERROR:  malformed vector literal
LINE 1: SELECT '[1,2,3'::vector;
               ^
DETAIL:  Unexpected end of input.
SELECT '[1,2,3]9'::vector;
ERROR:  malformed vector literal
LINE 1: SELECT '[1,2,3]9'::vector;
               ^
DETAIL:  Junk after closing right brace.
SELECT '1,2,3'::vector;
ERROR:  malformed vector literal: "1,2,3"
LINE 1: SELECT '1,2,3'::vector;
               ^
DETAIL:  Vector contents must start with "[".
SELECT '[]'::vector;
ERROR:  vector must have at least 1 dimension
LINE 1: SELECT '[]'::vector;
               ^
SELECT '[1,]'::vector;
ERROR:  invalid input syntax for type vector: "]"
LINE 1: SELECT '[1,]'::vector;
               ^
SELECT '[1,2,3]'::vector(2);
ERROR:  expected 2 dimensions, not 3
SELECT unnest('{"[1,2,3]", "[4,5,6]"}'::vector[]);
 unnest  
---------
 [1,2,3]
 [4,5,6]
(2 rows)

SELECT '{"[1,2,3]"}'::vector(2)[];
ERROR:  expected 2 dimensions, not 3