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