-- Regression test for the NULL handling in the incremental API.
--
-- None of the incremental functions is strict, so NULL arguments do reach
-- them. Adding a NULL value (or merging a NULL digest) is a no-op, and
-- returns the digest passed in - possibly NULL, if that was NULL too.
-- tdigest_add_double_increment
SELECT tdigest_add(NULL::tdigest, NULL::double precision);
 tdigest_add 
-------------
 
(1 row)

SELECT tdigest_add('flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest, NULL::double precision);
                    tdigest_add                     
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)

SELECT tdigest_add(NULL::tdigest, 1.0::double precision, 100);
                    tdigest_add                     
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)

-- tdigest_add_double_array_increment
SELECT tdigest_add(NULL::tdigest, NULL::double precision[]);
 tdigest_add 
-------------
 
(1 row)

SELECT tdigest_add('flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest, NULL::double precision[]);
                    tdigest_add                     
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)

SELECT tdigest_add(NULL::tdigest, ARRAY[1.0]::double precision[], 100);
                    tdigest_add                     
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)

-- tdigest_union_double_increment
SELECT tdigest_union(NULL::tdigest, NULL::tdigest);
 tdigest_union 
---------------
 
(1 row)

SELECT tdigest_union('flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest, NULL::tdigest);
                   tdigest_union                    
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)

SELECT tdigest_union(NULL::tdigest, 'flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest);
                   tdigest_union                    
----------------------------------------------------
 flags 1 count 1 compression 100 centroids 1 (1, 1)
(1 row)