system table improvements#79090
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gingerwizard merged 7 commits intoClickHouse:masterfrom Apr 13, 2025
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| SELECT | ||
| hostname() AS host, | ||
| count() | ||
| FROM clusterAllReplicas('default', merge('system', 'query_log*')) |
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This regular expression is incorrect.
It matches query_logggggggggggg and also unquery_log, but not what you thought.
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SELECT
_table,
hostname() AS host,
count()
FROM clusterAllReplicas('default', merge('system', 'query_log*'))
WHERE (event_time >= '2025-04-01 00:00:00') AND (event_time <= '2025-04-12 00:00:00')
GROUP BY
host,
_table
Query id: b7802cc4-d3e0-4043-b7ce-a7f344029ff2
┌─_table──────┬─host──────────────────────────┬─count()─┐
1. │ query_log_1 │ c-ecru-qn-34-server-6em4y4t-0 │ 1507410 │
2. │ query_log_3 │ c-ecru-qn-34-server-s5bnysl-0 │ 1495410 │
3. │ query_log_1 │ c-ecru-qn-34-server-s5bnysl-0 │ 428129 │
4. │ query_log │ c-ecru-qn-34-server-iejrkg0-0 │ 641155 │
5. │ query_log_2 │ c-ecru-qn-34-server-s5bnysl-0 │ 433918 │
6. │ query_log_2 │ c-ecru-qn-34-server-6em4y4t-0 │ 1496004 │
7. │ query_log_1 │ c-ecru-qn-34-server-iejrkg0-0 │ 437132 │
8. │ query_log │ c-ecru-qn-34-server-6em4y4t-0 │ 656029 │
9. │ query_log │ c-ecru-qn-34-server-s5bnysl-0 │ 650543 │
└─────────────┴───────────────────────────────┴─────────┘that matches what i expected
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i can make it '^query_log.*'
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made '^query_log.*'
| SELECT | ||
| _table, | ||
| max(event_time) AS most_recent | ||
| FROM merge('system', 'query_log*') |
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made '^query_log.*'
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@gingerwizard, I've corrected the mistake here: 64fab30 |
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Addresses questions around system table versions as well as querying across nodes @cwurm
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