DROP TABLE IF EXISTS test.stored_aggregates; CREATE TABLE test.stored_aggregates ( d Date, Uniq AggregateFunction(uniq, UInt64) ) ENGINE = AggregatingMergeTree(d, d, 8192); INSERT INTO test.stored_aggregates SELECT toDate('2014-06-01') AS d, uniqState(number) AS Uniq FROM ( SELECT * FROM system.numbers LIMIT 1000 ); SELECT uniqMerge(Uniq) FROM test.stored_aggregates; DROP TABLE test.stored_aggregates;