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60 lines
1.9 KiB
SQL
60 lines
1.9 KiB
SQL
CREATE TABLE test (id UInt64, `amax` AggregateFunction(argMax, String, DateTime))
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ENGINE=MergeTree()
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ORDER BY id
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SETTINGS ratio_of_defaults_for_sparse_serialization=1 -- Sparse columns will take more bytes for a single row
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AS
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SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
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FROM numbers(1)
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GROUP BY number;
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SELECT sum(id) FROM test FORMAT Null;
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SELECT argMaxMerge(amax) FROM test FORMAT Null;
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INSERT INTO test
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SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
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FROM numbers(9)
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GROUP BY number;
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SELECT sum(id) FROM test FORMAT Null;
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SELECT argMaxMerge(amax) FROM test FORMAT Null;
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INSERT INTO test
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SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
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FROM numbers(990)
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GROUP BY number;
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SELECT sum(id) FROM test FORMAT Null;
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SELECT argMaxMerge(amax) FROM test FORMAT Null;
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SYSTEM FLUSH LOGS;
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SELECT 'UInt64',
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read_rows,
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read_bytes
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FROM system.query_log
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WHERE
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current_database = currentDatabase() AND
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query = 'SELECT sum(id) FROM test FORMAT Null;' AND
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type = 2 AND event_date >= yesterday()
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ORDER BY event_time_microseconds;
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-- Size of ColumnAggregateFunction: Number of pointers * pointer size + arena size
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-- 1 * 8 + AggregateFunction(argMax, String, DateTime)
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--
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-- Size of AggregateFunction(argMax, String, DateTime):
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-- SingleValueDataString() + SingleValueDataFixed(DateTime)
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-- SingleValueDataString = 64B for small strings, 64B + string size + 1 for larger
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-- SingleValueDataFixed(DateTime) = 1 + 4. With padding = 8
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-- SingleValueDataString Total: 72B
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--
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-- ColumnAggregateFunction total: 8 + 72 = 80
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SELECT 'AggregateFunction(argMax, String, DateTime)',
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read_rows,
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read_bytes
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FROM system.query_log
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WHERE
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current_database = currentDatabase() AND
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query = 'SELECT argMaxMerge(amax) FROM test FORMAT Null;' AND
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type = 2 AND event_date >= yesterday()
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ORDER BY event_time_microseconds;
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