ClickHouse/dbms/tests/queries/0_stateless/00531_aggregate_over_nullable.sql

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DROP TABLE IF EXISTS agg_over_nullable;
CREATE TABLE agg_over_nullable (
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partition Date,
timestamp DateTime,
user_id Nullable(UInt32),
description Nullable(String)
) ENGINE = MergeTree(partition, timestamp, 8192);
INSERT INTO agg_over_nullable(partition, timestamp, user_id, description) VALUES(now(), now(), 1, 'ss');
INSERT INTO agg_over_nullable(partition, timestamp, user_id, description) VALUES(now(), now(), 1, NULL);
INSERT INTO agg_over_nullable(partition, timestamp, user_id, description) VALUES(now(), now(), 1, 'aa');
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SELECT arraySort(groupUniqArray(description)) FROM agg_over_nullable;
SELECT arraySort(topK(3)(description)) FROM agg_over_nullable;
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DROP TABLE agg_over_nullable;