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Add a test for max_threads optimization for simple queries

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This commit is contained in:
Azat Khuzhin 2020-05-21 21:41:37 +03:00
parent 0e12edb895
commit 8c69245283
2 changed files with 21 additions and 0 deletions
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tests/queries/0_stateless/01283_max_threads_simple_query_optimization.reference Normal file
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tests/queries/0_stateless/01283_max_threads_simple_query_optimization.sql Normal file
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DROP TABLE IF EXISTS data_01283;
CREATE TABLE data_01283 engine=MergeTree()
ORDER BY key
PARTITION BY key
AS SELECT number key FROM numbers(10);
SET log_queries=1;
SELECT * FROM data_01283 LIMIT 1 FORMAT Null;
SET log_queries=0;
SYSTEM FLUSH LOGS;
-- 1 for PullingAsyncPipelineExecutor::pull
-- 1 for AsynchronousBlockInputStream
SELECT
throwIf(count() != 1, 'no query was logged'),
throwIf(length(thread_ids) != 2, 'too many threads used')
FROM system.query_log
WHERE type = 'QueryFinish' AND query LIKE '%data_01283 LIMIT 1%'
GROUP BY thread_ids
FORMAT Null;