datastore/tests/performance/order_by_single_nullable.xml

<test>
    <create_query>CREATE TABLE IF NOT EXISTS t_opt_orderby (a UInt64, b Nullable(UInt64)) ENGINE = Memory()</create_query>
    <fill_query>insert into t_opt_orderby select * from  generateRandom('a UInt64, b Nullable(UInt64)') limit 10000000</fill_query>

    <settings>
        <max_threads>1</max_threads>
        <compile_sort_description>0</compile_sort_description>
    </settings>

    <query>select a from t_opt_orderby order by a</query>
    <query>select b from t_opt_orderby order by b</query>

    <drop_query>DROP TABLE IF EXISTS t_opt_orderby</drop_query>
</test>