mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-19 04:42:37 +00:00
37 lines
1.7 KiB
SQL
37 lines
1.7 KiB
SQL
DROP TABLE IF EXISTS t_uniq_exact;
|
|
|
|
CREATE TABLE t_uniq_exact (a UInt64, b String, c UInt64) ENGINE = MergeTree ORDER BY a;
|
|
|
|
SET group_by_two_level_threshold_bytes = 1;
|
|
SET group_by_two_level_threshold = 1;
|
|
SET max_threads = 4;
|
|
SET max_bytes_before_external_group_by = 0;
|
|
SET optimize_aggregation_in_order = 0;
|
|
|
|
INSERT INTO t_uniq_exact SELECT 0, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 1, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 2, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 3, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 4, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 5, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 6, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 7, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 8, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
INSERT INTO t_uniq_exact SELECT 9, randomPrintableASCII(5), rand() FROM numbers(300000);
|
|
|
|
OPTIMIZE TABLE t_uniq_exact FINAL;
|
|
|
|
SELECT a, uniqExact(b) FROM t_uniq_exact GROUP BY a ORDER BY a
|
|
SETTINGS min_hit_rate_to_use_consecutive_keys_optimization = 1.0
|
|
EXCEPT
|
|
SELECT a, uniqExact(b) FROM t_uniq_exact GROUP BY a ORDER BY a
|
|
SETTINGS min_hit_rate_to_use_consecutive_keys_optimization = 0.5;
|
|
|
|
SELECT a, sum(c) FROM t_uniq_exact GROUP BY a ORDER BY a
|
|
SETTINGS min_hit_rate_to_use_consecutive_keys_optimization = 1.0
|
|
EXCEPT
|
|
SELECT a, sum(c) FROM t_uniq_exact GROUP BY a ORDER BY a
|
|
SETTINGS min_hit_rate_to_use_consecutive_keys_optimization = 0.5;
|
|
|
|
DROP TABLE t_uniq_exact;
|