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datastore/tests/performance/aggregation_external.xml

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<test>
<settings>
<max_threads>30</max_threads>
<max_bytes_ratio_before_external_group_by>0</max_bytes_ratio_before_external_group_by>
<max_bytes_before_external_group_by>10485760</max_bytes_before_external_group_by>
</settings>
<query>SELECT number, count() FROM numbers_mt(5000000) GROUP BY number FORMAT Null;</query>
<query>SELECT number, count() FROM numbers_mt(15000000) GROUP BY number FORMAT Null;</query>
<query>SELECT number, count() FROM numbers_mt(30000000) GROUP BY number FORMAT Null;</query>
</test>