SELECT array_to_min('{}'::float[]);
 array_to_min 
--------------
             
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::smallint[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::integer[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::bigint[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::real[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::float[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{1,1,5,2,0}'::text[]);
ERROR:  Min subject must be SMALLINT, INTEGER, BIGINT, REAL, or DOUBLE PRECISION values
SELECT array_to_min('{NULL}'::float[]);
 array_to_min 
--------------
             
(1 row)

SELECT array_to_min('{1,1,NULL,2,0}'::float[]);
 array_to_min 
--------------
            0
(1 row)

SELECT array_to_min('{NULL,1,1,2}'::float[]);
 array_to_min 
--------------
            1
(1 row)

SELECT array_to_min('{1,1,2,NULL}'::float[]);
 array_to_min 
--------------
            1
(1 row)