mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-08 23:42:02 +00:00
62 lines
2.0 KiB
SQL
62 lines
2.0 KiB
SQL
SET merge_tree_read_split_ranges_into_intersecting_and_non_intersecting_injection_probability = 0.0;
|
|
|
|
CREATE TABLE test (id UInt64, `amax` AggregateFunction(argMax, String, DateTime))
|
|
ENGINE=MergeTree()
|
|
ORDER BY id
|
|
SETTINGS ratio_of_defaults_for_sparse_serialization=1 -- Sparse columns will take more bytes for a single row
|
|
AS
|
|
SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
|
|
FROM numbers(1)
|
|
GROUP BY number;
|
|
|
|
SELECT sum(id) FROM test FORMAT Null;
|
|
SELECT argMaxMerge(amax) FROM test FORMAT Null;
|
|
|
|
INSERT INTO test
|
|
SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
|
|
FROM numbers(9)
|
|
GROUP BY number;
|
|
|
|
SELECT sum(id) FROM test FORMAT Null;
|
|
SELECT argMaxMerge(amax) FROM test FORMAT Null;
|
|
|
|
INSERT INTO test
|
|
SELECT number, argMaxState(number::String, '2023-04-12 16:23:01'::DateTime)
|
|
FROM numbers(990)
|
|
GROUP BY number;
|
|
|
|
SELECT sum(id) FROM test FORMAT Null;
|
|
SELECT argMaxMerge(amax) FROM test FORMAT Null;
|
|
|
|
SYSTEM FLUSH LOGS;
|
|
|
|
SELECT 'UInt64',
|
|
read_rows,
|
|
read_bytes
|
|
FROM system.query_log
|
|
WHERE
|
|
current_database = currentDatabase() AND
|
|
query = 'SELECT sum(id) FROM test FORMAT Null;' AND
|
|
type = 2 AND event_date >= yesterday()
|
|
ORDER BY event_time_microseconds;
|
|
|
|
-- Size of ColumnAggregateFunction: Number of pointers * pointer size + arena size
|
|
-- 1 * 8 + AggregateFunction(argMax, String, DateTime)
|
|
--
|
|
-- Size of AggregateFunction(argMax, String, DateTime):
|
|
-- 1 Base class + 1 specific/value class:
|
|
-- Base class: MAX(sizeOf(SingleValueDataFixed<T>), sizeOf(SingleValueDataString), sizeOf(SingleValueDataGeneric)) = 64
|
|
-- Specific class: SingleValueDataFixed(DateTime) = 4 + 1. With padding = 8
|
|
-- Total: 8 + 64 + 8 = 80
|
|
--
|
|
-- ColumnAggregateFunction total: 8 + 2 * 64 = 136
|
|
SELECT 'AggregateFunction(argMax, String, DateTime)',
|
|
read_rows,
|
|
read_bytes
|
|
FROM system.query_log
|
|
WHERE
|
|
current_database = currentDatabase() AND
|
|
query = 'SELECT argMaxMerge(amax) FROM test FORMAT Null;' AND
|
|
type = 2 AND event_date >= yesterday()
|
|
ORDER BY event_time_microseconds;
|