datastore/tests/performance/delta_decode.xml

<test>
    <settings>
        <allow_suspicious_codecs>1</allow_suspicious_codecs>
    </settings>

    <substitutions>
        <substitution>
            <name>type</name>
            <values>
                <value>UInt8</value>
                <value>UInt16</value>
                <value>UInt32</value>
                <value>UInt64</value>
            </values>
        </substitution>
        <substitution>
            <name>pattern</name>
            <values>
                <value>seq</value> <!-- consecutive, wraps through the full range of narrow types -->
                <value>gap</value> <!-- monotonic with random gaps, wraps through the full range of narrow types -->
                <value>rnd</value> <!-- random over the full range of the type -->
            </values>
        </substitution>
    </substitutions>

    <create_query>
        CREATE TABLE IF NOT EXISTS delta_decode_{pattern}_{type}
        (n {type} CODEC(Delta))
        ENGINE = MergeTree
        ORDER BY tuple()
    </create_query>

    <fill_query>INSERT INTO delta_decode_seq_{type} (n) SELECT to{type}(number) FROM system.numbers LIMIT 50000000 SETTINGS max_threads=1</fill_query>
    <fill_query>INSERT INTO delta_decode_gap_{type} (n) SELECT to{type}(number * intExp2(4 * byteSize(to{type}(0))) + intHash64(number) % intExp2(4 * byteSize(to{type}(0)))) FROM system.numbers LIMIT 50000000 SETTINGS max_threads=1</fill_query>
    <fill_query>INSERT INTO delta_decode_rnd_{type} (n) SELECT to{type}(intHash64(number)) FROM system.numbers LIMIT 50000000 SETTINGS max_threads=1</fill_query>
    <fill_query>OPTIMIZE TABLE delta_decode_{pattern}_{type} FINAL SETTINGS optimize_throw_if_noop = 1</fill_query>

    <query>SELECT count() FROM delta_decode_{pattern}_{type} WHERE NOT ignore(n) SETTINGS max_threads=1</query>

    <drop_query>DROP TABLE IF EXISTS delta_decode_{pattern}_{type}</drop_query>
</test>