ClickHouse/tests/performance/group_by_sundy_li.xml

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<test>
<settings>
<max_insert_threads>8</max_insert_threads>
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<optimize_use_projections>0</optimize_use_projections>
</settings>
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<create_query>
CREATE TABLE a
(
d Date,
os String,
n UInt64
)
ENGINE = MergeTree
PARTITION BY d
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ORDER BY (d, n)
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</create_query>
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<fill_query>insert into a select '2000-01-01', ['aa','bb','cc','dd'][number % 4 + 1], number from numbers_mt(10000000)</fill_query>
<fill_query>insert into a select '2000-01-02', ['aa','bb','cc','dd'][number % 4 + 1], number from numbers_mt(10000000)</fill_query>
<fill_query>insert into a select '2000-01-03', ['aa','bb','cc','dd'][number % 4 + 1], number from numbers_mt(10000000)</fill_query>
<fill_query>insert into a select '2000-01-04', ['aa','bb','cc','dd'][number % 4 + 1], number from numbers_mt(10000000)</fill_query>
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<fill_query>OPTIMIZE TABLE a FINAL</fill_query>
<query>select d, count() from a group by d</query>
<query>select os, count() from a group by os</query>
<query>select d, os, count() from a group by d, os</query>
<drop_query>drop table if exists a</drop_query>
</test>