mirror of
https://github.com/GreptimeTeam/greptimedb.git
synced 2026-01-16 10:12:58 +00:00
4d6fe31fff
* fix: flow schema cache * refactor: location for `to_meta_err` * chore: endfile emptyline * chore: review(partially) * chore: per review * refactor: per review * refactor: per review
108 lines
3.1 KiB
Plaintext
108 lines
3.1 KiB
Plaintext
-- test if flow can get table schema correctly after table have been altered
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CREATE TABLE bytes_log (
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byte INT,
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ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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-- event time
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TIME INDEX(ts)
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);
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Affected Rows: 0
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CREATE TABLE approx_rate (
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rate DOUBLE,
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time_window TIMESTAMP,
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update_at TIMESTAMP,
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TIME INDEX(time_window)
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);
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Affected Rows: 0
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-- make both src&sink table in cache of flownode by using them
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CREATE FLOW find_approx_rate SINK TO approx_rate AS
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SELECT
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(max(byte) - min(byte)) / 30.0 as rate,
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date_bin(INTERVAL '30 second', ts) as time_window
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from
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bytes_log
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GROUP BY
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time_window;
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Affected Rows: 0
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SHOW CREATE FLOW find_approx_rate;
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+------------------+-----------------------------------------------------------------------------------------------------------------------------------------+
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| Flow | Create Flow |
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+------------------+-----------------------------------------------------------------------------------------------------------------------------------------+
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| find_approx_rate | CREATE FLOW IF NOT EXISTS find_approx_rate |
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| | SINK TO approx_rate |
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| | AS SELECT (max(byte) - min(byte)) / 30.0 AS rate, date_bin(INTERVAL '30 second', ts) AS time_window FROM bytes_log GROUP BY time_window |
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+------------------+-----------------------------------------------------------------------------------------------------------------------------------------+
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DROP FLOW find_approx_rate;
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Affected Rows: 0
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ALTER TABLE bytes_log ADD COLUMN stat INT DEFAULT 200 AFTER byte;
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Affected Rows: 0
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ALTER TABLE approx_rate ADD COLUMN sample_cnt INT64 DEFAULT 0 AFTER rate;
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Affected Rows: 0
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CREATE FLOW find_approx_rate SINK TO approx_rate AS
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SELECT
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(max(byte) - min(byte)) / 30.0 as rate,
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count(byte) as sample_cnt,
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date_bin(INTERVAL '30 second', ts) as time_window
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from
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bytes_log
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GROUP BY
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time_window;
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Affected Rows: 0
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INSERT INTO
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bytes_log
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VALUES
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(0, 200, '2023-01-01 00:00:01'),
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(300,200, '2023-01-01 00:00:29');
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Affected Rows: 2
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-- SQLNESS REPLACE (ADMIN\sFLUSH_FLOW\('\w+'\)\s+\|\n\+-+\+\n\|\s+)[0-9]+\s+\| $1 FLOW_FLUSHED |
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ADMIN FLUSH_FLOW('find_approx_rate');
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+--------------------------------------+
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| ADMIN FLUSH_FLOW('find_approx_rate') |
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+--------------------------------------+
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| FLOW_FLUSHED |
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+--------------------------------------+
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SELECT
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rate,
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sample_cnt,
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time_window
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FROM
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approx_rate;
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+------+------------+---------------------+
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| rate | sample_cnt | time_window |
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+------+------------+---------------------+
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| 10.0 | 2 | 2023-01-01T00:00:00 |
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+------+------------+---------------------+
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DROP TABLE bytes_log;
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Affected Rows: 0
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DROP FLOW find_approx_rate;
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Affected Rows: 0
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DROP TABLE approx_rate;
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Affected Rows: 0
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