ClickHouse/tests/performance/read_in_order_many_parts.xml

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<test>
<settings>
<optimize_aggregation_in_order>1</optimize_aggregation_in_order>
<optimize_read_in_order>1</optimize_read_in_order>
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<max_partitions_per_insert_block>2000</max_partitions_per_insert_block>
<max_insert_block_size>10000000</max_insert_block_size>
<max_threads>8</max_threads>
</settings>
<substitutions>
<substitution>
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<name>parts</name>
<values>
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<value>100</value>
<value>1000</value>
</values>
</substitution>
</substitutions>
<create_query>CREATE TABLE mt_{parts}_parts(id UInt32, val1 UInt32, val2 UInt32) ENGINE = MergeTree ORDER BY val1 PARTITION BY id % {parts} SETTINGS parts_to_throw_insert=10000, parts_to_delay_insert=10000</create_query>
<fill_query>SYSTEM STOP MERGES mt_{parts}_parts</fill_query>
<fill_query>INSERT INTO mt_{parts}_parts SELECT number, rand() % 10000, rand() FROM numbers_mt(100000000) SETTINGS max_block_size=10000000</fill_query>
<fill_query>SYSTEM START MERGES mt_{parts}_parts</fill_query>
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<fill_query>OPTIMIZE TABLE mt_{parts}_parts FINAL</fill_query>
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<query>SELECT val2 FROM mt_{parts}_parts ORDER BY val1 LIMIT 1000000 FORMAT Null</query>
<query>SELECT val2 FROM mt_{parts}_parts ORDER BY val1 LIMIT 10000000 FORMAT Null</query>
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<query>SELECT sum(val2) FROM mt_{parts}_parts GROUP BY val1 FORMAT Null</query>
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<drop_query>DROP TABLE IF EXISTS mt_{parts}_parts</drop_query>
</test>