ClickHouse/dbms/tests/queries/1_stateful/00084_external_aggregation.sql

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SET max_bytes_before_external_group_by = 200000000;
SET max_memory_usage = 1500000000;
SET max_threads = 12;
SELECT URL, uniq(SearchPhrase) AS u FROM test.hits GROUP BY URL ORDER BY u DESC, URL LIMIT 10;
SET max_memory_usage = 300000000;
SET max_threads = 2;
SET aggregation_memory_efficient_merge_threads = 1;
SELECT URL, uniq(SearchPhrase) AS u FROM test.hits GROUP BY URL ORDER BY u DESC, URL LIMIT 10;