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

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

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

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

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

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

SELECT array_to_mode('{1,1,5,2,0}'::text[]);
ERROR:  Mode subject must be SMALLINT, INTEGER, BIGINT, REAL, or DOUBLE PRECISION values
SELECT array_to_mode('{1,1,5,2,2,0}'::smallint[]);
 array_to_mode 
---------------
           1.5
(1 row)

SELECT array_to_mode('{1,1,5,2,2,0}'::integer[]);
 array_to_mode 
---------------
           1.5
(1 row)

SELECT array_to_mode('{1,1,5,2,2,0}'::bigint[]);
 array_to_mode 
---------------
           1.5
(1 row)

SELECT array_to_mode('{1,1,5,2,2,0}'::real[]);
 array_to_mode 
---------------
           1.5
(1 row)

SELECT array_to_mode('{1,1,5,2,2,0}'::float[]);
 array_to_mode 
---------------
           1.5
(1 row)