mirror of
https://github.com/GreptimeTeam/greptimedb.git
synced 2026-01-14 09:12:57 +00:00
108 lines
3.7 KiB
Plaintext
108 lines
3.7 KiB
Plaintext
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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);
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Affected Rows: 0
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INSERT INTO TABLE host VALUES
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(0, 'host1', 0),
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(5000, 'host1', null),
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(10000, 'host1', 1),
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(15000, 'host1', null),
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(20000, 'host1', 2),
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(0, 'host2', 3),
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(5000, 'host2', null),
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(10000, 'host2', 4),
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(15000, 'host2', null),
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(20000, 'host2', 5);
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Affected Rows: 10
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-- Test by calculate
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SELECT ts, length(host), max(val) RANGE '5s' FROM host ALIGN '20s' BY (length(host)) ORDER BY ts;
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+---------------------+-----------------------------+------------------------+
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| ts | character_length(host.host) | MAX(host.val) RANGE 5s |
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+---------------------+-----------------------------+------------------------+
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| 1970-01-01T00:00:00 | 5 | 3 |
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| 1970-01-01T00:00:20 | 5 | 5 |
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+---------------------+-----------------------------+------------------------+
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SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY (2) ORDER BY ts;
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+---------------------+------------------------+
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| ts | MAX(host.val) RANGE 5s |
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+---------------------+------------------------+
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| 1970-01-01T00:00:00 | 3 |
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| 1970-01-01T00:00:20 | 5 |
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+---------------------+------------------------+
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-- The user explicitly specifies that the aggregation key is empty. In this case, there is no aggregation key. All data will be aggregated into a group.
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-- Implement by rewrite `BY()` to `BY(1)` automatically through sqlparser. They are semantically equivalent.
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SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
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+---------------------+------------------------+
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| ts | MAX(host.val) RANGE 5s |
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+---------------------+------------------------+
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| 1970-01-01T00:00:00 | 3 |
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| 1970-01-01T00:00:20 | 5 |
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+---------------------+------------------------+
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SELECT ts, length(host)::INT64 + 2, max(val) RANGE '5s' FROM host ALIGN '20s' BY (length(host)::INT64 + 2) ORDER BY ts;
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+---------------------+----------------------------------------+------------------------+
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| ts | character_length(host.host) + Int64(2) | MAX(host.val) RANGE 5s |
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+---------------------+----------------------------------------+------------------------+
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| 1970-01-01T00:00:00 | 7 | 3 |
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| 1970-01-01T00:00:20 | 7 | 5 |
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+---------------------+----------------------------------------+------------------------+
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-- Test error
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-- project non-aggregation key
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SELECT ts, host, max(val) RANGE '5s' FROM host ALIGN '20s' BY () ORDER BY ts;
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Error: 3001(EngineExecuteQuery), DataFusion error: No field named host.host. Valid fields are "MAX(host.val) RANGE 5s", host.ts, "Int64(1)".
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DROP TABLE host;
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Affected Rows: 0
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-- Test no primary key and by keyword
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CREATE TABLE host (
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ts timestamp(3) time index,
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host STRING,
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val BIGINT,
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);
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Affected Rows: 0
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INSERT INTO TABLE host VALUES
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(0, 'host1', 0),
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(5000, 'host1', null),
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(10000, 'host1', 1),
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(15000, 'host1', null),
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(20000, 'host1', 2),
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(0, 'host2', 3),
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(5000, 'host2', null),
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(10000, 'host2', 4),
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(15000, 'host2', null),
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(20000, 'host2', 5);
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Affected Rows: 10
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SELECT ts, max(val) RANGE '5s' FROM host ALIGN '20s' ORDER BY ts;
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+---------------------+------------------------+
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| ts | MAX(host.val) RANGE 5s |
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+---------------------+------------------------+
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| 1970-01-01T00:00:00 | 3 |
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| 1970-01-01T00:00:20 | 5 |
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+---------------------+------------------------+
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DROP TABLE host;
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Affected Rows: 0
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