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https://github.com/GreptimeTeam/greptimedb.git
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e84b1eefdf
* perf: optimize count(*) Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * fallback to count(1) for temporary table Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * handle alias expr in range plan Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * handle subquery alias Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * rename file Signed-off-by: Ruihang Xia <waynestxia@gmail.com> --------- Signed-off-by: Ruihang Xia <waynestxia@gmail.com>
94 lines
2.9 KiB
SQL
94 lines
2.9 KiB
SQL
CREATE TABLE host (
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ts timestamp(3) time index,
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host STRING PRIMARY KEY,
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val BIGINT,
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addon BIGINT,
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);
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INSERT INTO TABLE host VALUES
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(0, 'host1', 0, 1),
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(1000, 'host1', 1, 2),
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(2000, 'host1', 2, 3),
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(5000, 'host1', null, 4),
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(6000, 'host1', null, 5),
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(7000, 'host1', null, 6),
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(10000, 'host1', null, 7),
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(11000, 'host1', 4, 8),
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(12000, 'host1', 5, 9),
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(15000, 'host1', 6, 10),
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(16000, 'host1', null, 11),
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(17000, 'host1', 7, 12),
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(20000, 'host1', 8, 13),
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(21000, 'host1', 9, 14),
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(22000, 'host1', null, 15),
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(0, 'host2', 0, 16),
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(1000, 'host2', 1, 17),
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(2000, 'host2', 2, 18),
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(5000, 'host2', null, 19),
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(6000, 'host2', null, 20),
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(7000, 'host2', null, 21),
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(10000, 'host2', null, 22),
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(11000, 'host2', 4, 23),
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(12000, 'host2', 5, 24),
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(15000, 'host2', 6, 25),
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(16000, 'host2', null, 26),
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(17000, 'host2', 7, 27),
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(20000, 'host2', 8, 28),
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(21000, 'host2', 9, 29),
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(22000, 'host2', null, 30);
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SELECT ts, host, first_value(val) RANGE '5s', last_value(val) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, first_value(addon ORDER BY val DESC) RANGE '5s', last_value(addon ORDER BY val DESC) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, first_value(addon ORDER BY val DESC NULLS LAST) RANGE '5s', last_value(addon ORDER BY val DESC NULLS LAST) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, first_value(addon ORDER BY val ASC) RANGE '5s', last_value(addon ORDER BY val ASC) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, first_value(addon ORDER BY val ASC NULLS FIRST) RANGE '5s', last_value(addon ORDER BY val ASC NULLS FIRST) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, first_value(addon ORDER BY val ASC, ts ASC) RANGE '5s', last_value(addon ORDER BY val ASC, ts ASC) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, count(val) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, count(distinct val) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, count(*) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, count(1) RANGE '5s' as abc FROM host ALIGN '5s' ORDER BY host, ts;
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SELECT ts, host, count(distinct *) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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-- Test error first_value/last_value
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SELECT ts, host, first_value(val, val) RANGE '5s' FROM host ALIGN '5s' ORDER BY host, ts;
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DROP TABLE host;
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-- Test first_value/last_value will execute sort
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CREATE TABLE host (
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ts timestamp(3) time index,
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host STRING PRIMARY KEY,
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val BIGINT,
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addon BIGINT,
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);
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INSERT INTO TABLE host VALUES
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(0, 'host1', 0, 3),
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(1000, 'host1', 1, 2),
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(2000, 'host1', 2, 1);
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SELECT ts, first_value(val ORDER BY addon ASC) RANGE '5s', last_value(val ORDER BY addon ASC) RANGE '5s' FROM host ALIGN '5s';
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DROP TABLE host;
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