ClickHouse/tests/queries/0_stateless/00425_count_nullable.sql

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SELECT count() FROM (SELECT number AS x FROM system.numbers LIMIT 10);
SELECT count(x) FROM (SELECT number AS x FROM system.numbers LIMIT 10);
SELECT count(x) FROM (SELECT CAST(number AS Nullable(UInt64)) AS x FROM system.numbers LIMIT 10);
SELECT count(x) FROM (SELECT nullIf(number, 5) AS x FROM system.numbers LIMIT 10);
SELECT count(NULL);