ClickHouse/dbms/tests/queries/0_stateless/00614_array_nullable.sql

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DROP TABLE IF EXISTS test.test;
CREATE TABLE test.test(date Date, keys Array(Nullable(UInt8))) ENGINE = MergeTree(date, date, 1);
INSERT INTO test.test VALUES ('2017-09-10', [1, 2, 3, 4, 5, 6, 7, NULL]);
SELECT * FROM test.test LIMIT 1;
SELECT avgArray(keys) FROM test.test;
DROP TABLE test.test;