UDAF + multiple DISTINCT in projection produces an invalid answer

DROP TABLE IF EXISTS cs1;

CREATE TABLE cs1 (d1 DECIMAL(18), d2 DECIMAL(18,10), d3 DECIMAL(18,18), d4 DECIMAL(18),d5 DECIMAL(18),i1 INT) ENGINE=columnstore;

INSERT INTO cs1 VALUES

    (1234,5678,-0.1234567890,2,1,1),     

    (1234,-5678,0.1234567890,2,1,1),

    (123456789012,12345012.9012345678,0.12345634567890,2,1,1),

    (NULL,NULL,NULL,2,1,1),

    (0,0,0,2,1,1),

    (1234,5678,0.123456789012345678,3,2,2),

    (-123456789123456789,-5678,0.123456782345678,3,2,2),

    (12345678901234567,1234524.9012345678,0.1234567895678908,3,2,2),

    (NULL,NULL,NULL,3,2,2),

    (0,0,0,3,2,2),

    (1234,5678,-0.12345673,11111111111111111,1,1),

    (1234,5678,-0.12345673,11111111111111111,1,1),

    (1234,5678,-0.12345673,11111111111111112,1,1); 

select  regr_avgx(d1,d2), count(distinct (d4)), count(distinct (d3)), count(distinct (d2)) from cs1 group by d1;