ClickHouse/tests/queries/0_stateless/00738_nested_merge_multidimensional_array.sql

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DROP TABLE IF EXISTS sites;
CREATE TABLE sites (Domain UInt8, `Users.UserID` Array(UInt64), `Users.Dates` Array(Array(Date))) ENGINE = MergeTree ORDER BY Domain SETTINGS vertical_merge_algorithm_min_rows_to_activate = 0, vertical_merge_algorithm_min_columns_to_activate = 0;
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SYSTEM STOP MERGES sites;
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INSERT INTO sites VALUES (1,[1],[[]]);
INSERT INTO sites VALUES (2,[1],[['2018-06-22']]);
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SELECT count(), countArray(Users.Dates), countArrayArray(Users.Dates) FROM sites;
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SYSTEM START MERGES sites;
OPTIMIZE TABLE sites FINAL;
SELECT count(), countArray(Users.Dates), countArrayArray(Users.Dates) FROM sites;
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DROP TABLE sites;