ClickHouse/tests/performance/countIf.xml

<test>
    <query>SELECT countIf(number % 2) FROM numbers(100000000)</query>

    <query>
        SELECT countIf(key IS NOT NULL)
        FROM
        (
            SELECT materialize(toNullable(1)) AS key
            FROM numbers(100000000)
        )
    </query>

    <query>
        SELECT countIf(key IS NOT NULL)
        FROM
        (
            SELECT materialize(CAST(NULL, 'Nullable(Int8)')) AS key
            FROM numbers(100000000)
        )
    </query>
</test>