ClickHouse/dbms/tests/queries/0_stateless/00208_agg_state_merge.sql

SELECT k % 7 AS k2, finalizeAggregation(uniqMergeState(state)), uniqMerge(state) FROM (SELECT k, uniqState(x) AS state FROM (SELECT number % 11 AS k, intDiv(number, 7)  AS x FROM system.numbers LIMIT 100) GROUP BY k) GROUP BY k2 ORDER BY k2;