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531e3b13ce
Because of failed rebase/push this part of the patch was lost, so resending separatelly (sigh). Follow-up for: #39177 (cc @yakov-olkhovskiy) Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
19 lines
638 B
Plaintext
19 lines
638 B
Plaintext
-- { echo }
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SELECT count() > 0 FROM system.stack_trace WHERE query_id != '';
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1
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-- opimization for not reading /proc/self/task/{}/comm and avoid sending signal
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SELECT countIf(thread_id > 0) > 0 FROM system.stack_trace;
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1
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-- optimization for trace
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SELECT length(trace) > 0 FROM system.stack_trace LIMIT 1;
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1
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-- optimization for query_id
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SELECT length(query_id) > 0 FROM system.stack_trace WHERE query_id != '' LIMIT 1;
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1
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-- optimization for thread_name
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SELECT length(thread_name) > 0 FROM system.stack_trace WHERE thread_name != '' LIMIT 1;
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1
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-- enough rows (optimizations works "correctly")
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SELECT count() > 100 FROM system.stack_trace;
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1
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