Calcite engine. Wrong result for single-value aggregation from empty source

SELECT (SELECT 1 FROM (SELECT 1) WHERE 1 = 0)

CREATE TABLE test (a INTEGER)
INSERT INTO test VALUES (1), (2), (null)
SELECT (SELECT 1 FROM test t WHERE a = test.a) FROM test

Let SS be a <scalar subquery>.
Case:
a) If the cardinality of SS is greater than 1 (one), then an exception condition is raised: cardinality violation.
b) If the cardinality of SS is 0 (zero), then the value of the <scalar subquery> is the null value.
c) Otherwise, let C be the column of <query expression> simply contained in SS. The value of SS is the value of C in the unique row of the result of the <scalar subquery>.