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26 lines
937 B
SQL
26 lines
937 B
SQL
SET group_by_two_level_threshold_bytes = 1;
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SET group_by_two_level_threshold = 1;
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SELECT groupArray(DISTINCT toString(number % 10)) FROM numbers_mt(50000)
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GROUP BY number ORDER BY number LIMIT 10
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SETTINGS max_threads = 2, max_block_size = 2000;
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DROP TABLE IF EXISTS dictinct_two_level;
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CREATE TABLE dictinct_two_level (
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time DateTime64(3),
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domain String,
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subdomain String
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) ENGINE = MergeTree ORDER BY time;
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INSERT INTO dictinct_two_level SELECT 1546300800000, 'test.com', concat('foo', toString(number % 10000)) from numbers(10000);
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INSERT INTO dictinct_two_level SELECT 1546300800000, concat('test.com', toString(number / 10000)) , concat('foo', toString(number % 10000)) from numbers(10000);
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SELECT
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domain, groupArraySample(5, 11111)(DISTINCT subdomain) AS example_subdomains
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FROM dictinct_two_level
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GROUP BY domain ORDER BY domain, example_subdomains
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LIMIT 10;
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DROP TABLE IF EXISTS dictinct_two_level;
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