-- Regression test for the NULL handling in the final functions.
--
-- None of the final functions is strict, so an aggregate over an empty
-- input calls them with a NULL state, and they have to return NULL. Each
-- final function is reached through the matching aggregate, with a WHERE
-- clause filtering out all the rows.
-- tdigest_percentiles
SELECT tdigest_percentile(v, 100, 0.5) FROM (VALUES (1.0)) AS t(v) WHERE v > 2.0;
 tdigest_percentile 
--------------------
                   
(1 row)

-- tdigest_percentiles_of
SELECT tdigest_percentile_of(v, 100, 1.0) FROM (VALUES (1.0)) AS t(v) WHERE v > 2.0;
 tdigest_percentile_of 
-----------------------
                      
(1 row)

-- tdigest_digest
SELECT tdigest(v, 100) FROM (VALUES (1.0)) AS t(v) WHERE v > 2.0;
 tdigest 
---------
 
(1 row)

-- tdigest_array_percentiles
SELECT tdigest_percentile(v, 100, ARRAY[0.5]) FROM (VALUES (1.0)) AS t(v) WHERE v > 2.0;
 tdigest_percentile 
--------------------
 
(1 row)

-- tdigest_array_percentiles_of
SELECT tdigest_percentile_of(v, 100, ARRAY[1.0]) FROM (VALUES (1.0)) AS t(v) WHERE v > 2.0;
 tdigest_percentile_of 
-----------------------
 
(1 row)