-- { echo }
explain syntax select null is null;
SELECT NULL IS NULL
explain syntax select null is not null;
SELECT NULL IS NOT NULL
explain syntax select isNull(null);
SELECT NULL IS NULL
explain syntax select isNotNull(null);
SELECT NULL IS NOT NULL
explain syntax select isNotNull(1)+isNotNull(2) from remote('127.2', system.one);
SELECT (1 IS NOT NULL) + (2 IS NOT NULL)
FROM remote(\'127.2\', \'system.one\')
select isNotNull(1)+isNotNull(2) from remote('127.2', system.one);
2