-- Regression test for the compression check in tdigest_add_double_increment()
-- and tdigest_add_double_array_increment(), the functions of the incremental
-- API.
--
-- The compression is only optional when there already is a t-digest to add
-- the value to, because that determines the compression. Without a digest
-- there is nothing to derive the compression from, so it has to be supplied.
\set VERBOSITY terse
-- NULL digest and NULL compression (which is the default)
SELECT tdigest_add(NULL::tdigest, 1.0::double precision);
ERROR:  compression value not supplied, but t-digest is NULL
SELECT tdigest_add(NULL::tdigest, 1.0::double precision, NULL::int);
ERROR:  compression value not supplied, but t-digest is NULL
SELECT tdigest_add(NULL::tdigest, ARRAY[1.0]::double precision[]);
ERROR:  compression value not supplied, but t-digest is NULL
SELECT tdigest_add(NULL::tdigest, ARRAY[1.0]::double precision[], NULL::int);
ERROR:  compression value not supplied, but t-digest is NULL
-- with the compression supplied it has to work
SELECT tdigest_add(NULL::tdigest, 1.0::double precision, 100);
                    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)

-- with an existing digest the compression is not needed
SELECT tdigest_add('flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest,
                   2.0::double precision);
                        tdigest_add                        
-----------------------------------------------------------
 flags 1 count 2 compression 100 centroids 2 (1, 1) (2, 1)
(1 row)

SELECT tdigest_add('flags 1 count 1 compression 100 centroids 1 (1, 1)'::tdigest,
                   ARRAY[2.0]::double precision[]);
                        tdigest_add                        
-----------------------------------------------------------
 flags 1 count 2 compression 100 centroids 2 (1, 1) (2, 1)
(1 row)