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38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
-- { echo }
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EXPLAIN PIPELINE SELECT sleep(1);
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(Expression)
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ExpressionTransform
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(ReadFromStorage)
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SourceFromSingleChunk 0 → 1
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SELECT sleep(1) SETTINGS log_processors_profiles=true, log_queries=1, log_queries_min_type='QUERY_FINISH';
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0
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SYSTEM FLUSH LOGS;
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WITH
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(
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SELECT query_id
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FROM system.query_log
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WHERE current_database = currentDatabase() AND Settings['log_processors_profiles']='1'
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) AS query_id_
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SELECT
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name,
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multiIf(
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-- ExpressionTransform executes sleep(),
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-- so IProcessor::work() will spend 1 sec.
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name = 'ExpressionTransform', elapsed_us>1e6,
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-- SourceFromSingleChunk, that feed data to ExpressionTransform,
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-- will feed first block and then wait in PortFull.
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name = 'SourceFromSingleChunk', output_wait_elapsed_us>1e6,
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-- NullSource/LazyOutputFormatLazyOutputFormat are the outputs
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-- so they cannot starts to execute before sleep(1) will be executed.
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input_wait_elapsed_us>1e6)
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elapsed
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FROM system.processors_profile_log
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WHERE query_id = query_id_
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ORDER BY name;
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ExpressionTransform 1
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LazyOutputFormat 1
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LimitsCheckingTransform 1
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NullSource 1
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NullSource 1
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SourceFromSingleChunk 1
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