-- Regression test for the count check in tdigest_add_double_values_count(),
-- the transition function of the tdigest_percentile_of() aggregates accepting
-- an explicit number of occurrences of a value.
--
-- The count says how many times the value is added to the digest, so it has
-- to be a positive value.
\set VERBOSITY terse
-- zero count
SELECT tdigest_percentile_of(v, 0::bigint, 100, 1.0) FROM (VALUES (1.0)) AS t(v);
ERROR:  invalid count value 0, must be a positive value
-- negative count
SELECT tdigest_percentile_of(v, -1::bigint, 100, 1.0) FROM (VALUES (1.0)) AS t(v);
ERROR:  invalid count value -1, must be a positive value
-- the smallest valid count has to work
SELECT tdigest_percentile_of(v, 1::bigint, 100, 1.0) FROM (VALUES (1.0)) AS t(v);
 tdigest_percentile_of 
-----------------------
                   0.5
(1 row)

-- NULL count means a single occurrence, so it's valid too
SELECT tdigest_percentile_of(v, NULL::bigint, 100, 1.0) FROM (VALUES (1.0)) AS t(v);
 tdigest_percentile_of 
-----------------------
                   0.5
(1 row)