--
-- num_nulls()
--
SELECT num_nonnulls(NULL);
 num_nonnulls 
--------------
            0
(1 row)

SELECT num_nonnulls('1');
 num_nonnulls 
--------------
            1
(1 row)

SELECT num_nonnulls(NULL::text);
 num_nonnulls 
--------------
            0
(1 row)

SELECT num_nonnulls(NULL::text, NULL::int);
 num_nonnulls 
--------------
            0
(1 row)

SELECT num_nonnulls(1, 2, NULL::text, NULL::point, '', int8 '9', 1.0 / NULL);
 num_nonnulls 
--------------
            4
(1 row)

SELECT num_nonnulls(VARIADIC '{1,2,NULL,3}'::int[]);
 num_nonnulls 
--------------
            3
(1 row)

SELECT num_nonnulls(VARIADIC '{"1","2","3","4"}'::text[]);
 num_nonnulls 
--------------
            4
(1 row)

SELECT num_nonnulls(VARIADIC ARRAY(SELECT CASE WHEN i <> 40 THEN i END FROM generate_series(1, 100) i));
 num_nonnulls 
--------------
           99
(1 row)

SELECT num_nulls(NULL);
 num_nulls 
-----------
         1
(1 row)

SELECT num_nulls('1');
 num_nulls 
-----------
         0
(1 row)

SELECT num_nulls(NULL::text);
 num_nulls 
-----------
         1
(1 row)

SELECT num_nulls(NULL::text, NULL::int);
 num_nulls 
-----------
         2
(1 row)

SELECT num_nulls(1, 2, NULL::text, NULL::point, '', int8 '9', 1.0 / NULL);
 num_nulls 
-----------
         3
(1 row)

SELECT num_nulls(VARIADIC '{1,2,NULL,3}'::int[]);
 num_nulls 
-----------
         1
(1 row)

SELECT num_nulls(VARIADIC '{"1","2","3","4"}'::text[]);
 num_nulls 
-----------
         0
(1 row)

SELECT num_nulls(VARIADIC ARRAY(SELECT CASE WHEN i <> 40 THEN i END FROM generate_series(1, 100) i));
 num_nulls 
-----------
         1
(1 row)

-- special cases
SELECT num_nonnulls(VARIADIC NULL::text[]);
 num_nonnulls 
--------------
             
(1 row)

SELECT num_nonnulls(VARIADIC '{}'::int[]);
 num_nonnulls 
--------------
            0
(1 row)

SELECT num_nulls(VARIADIC NULL::text[]);
 num_nulls 
-----------
          
(1 row)

SELECT num_nulls(VARIADIC '{}'::int[]);
 num_nulls 
-----------
         0
(1 row)

-- should fail, one or more arguments is required
SELECT num_nonnulls();
ERROR:  function num_nonnulls() does not exist
LINE 1: SELECT num_nonnulls();
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
SELECT num_nulls();
ERROR:  function num_nulls() does not exist
LINE 1: SELECT num_nulls();
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.