ClickHouse/tests/performance/merge_tree_many_partitions.xml

<test>
    <create_query>CREATE TABLE bad_partitions (x UInt64) ENGINE = MergeTree PARTITION BY x ORDER BY x</create_query>
    <fill_query>INSERT INTO bad_partitions SELECT * FROM numbers(10000)</fill_query>

    <settings>
        <max_partitions_per_insert_block>0</max_partitions_per_insert_block>
    </settings>

    <query short="1">SELECT count() FROM bad_partitions</query>

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