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Add cardinalities test
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Alex 1 63 0
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Alex 1 65 0
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Alex 1 239 0
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Alex 2 224 0
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Alex 4 83 0
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Alex 4 134 0
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Alex 4 192 0
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Bob 2 53 0
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Bob 4 100 0
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Bob 4 177 0
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Bob 4 177 0
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Nikita 1 173 0
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Nikita 1 228 0
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Nikita 2 148 0
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Nikita 2 148 0
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Nikita 2 208 0
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Alex 1 63 1
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Alex 1 65 1
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Alex 1 239 1
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Alex 2 128 1
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Alex 2 128 1
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Alex 2 224 1
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Alex 4 83 1
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Alex 4 83 1
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Alex 4 134 1
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Alex 4 134 1
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Alex 4 192 1
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Bob 2 53 1
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Bob 2 53 1
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Bob 2 187 1
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Bob 2 187 1
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Bob 4 100 1
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Nikita 1 173 1
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Nikita 1 228 1
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Nikita 2 54 1
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Nikita 2 54 1
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Nikita 2 148 1
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Nikita 2 208 1
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-- Checks that RowOptimizer correctly selects the order for columns according to cardinality, with an empty ORDER BY.
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-- There are 4 columns with cardinalities {name : 3, timestamp": 3, money: 17, flag: 2}, so the columns order must be {flag, name, timestamp, money}.
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DROP TABLE IF EXISTS tab;
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CREATE TABLE tab (name String, timestamp Int64, money UInt8, flag String) ENGINE = MergeTree ORDER BY () SETTINGS allow_experimental_optimized_row_order = True;
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INSERT INTO tab VALUES ('Bob', 4, 100, '1'), ('Nikita', 2, 54, '1'), ('Nikita', 1, 228, '1'), ('Alex', 4, 83, '1'), ('Alex', 4, 134, '1'), ('Alex', 1, 65, '0'), ('Alex', 4, 134, '1'), ('Bob', 2, 53, '0'), ('Alex', 4, 83, '0'), ('Alex', 1, 63, '1'), ('Bob', 2, 53, '1'), ('Alex', 4, 192, '1'), ('Alex', 2, 128, '1'), ('Nikita', 2, 148, '0'), ('Bob', 4, 177, '0'), ('Nikita', 1, 173, '0'), ('Alex', 1, 239, '0'), ('Alex', 1, 63, '0'), ('Alex', 2, 224, '1'), ('Bob', 4, 177, '0'), ('Alex', 2, 128, '1'), ('Alex', 4, 134, '0'), ('Alex', 4, 83, '1'), ('Bob', 4, 100, '0'), ('Nikita', 2, 54, '1'), ('Alex', 1, 239, '1'), ('Bob', 2, 187, '1'), ('Alex', 1, 65, '1'), ('Bob', 2, 53, '1'), ('Alex', 2, 224, '0'), ('Alex', 4, 192, '0'), ('Nikita', 1, 173, '1'), ('Nikita', 2, 148, '1'), ('Bob', 2, 187, '1'), ('Nikita', 2, 208, '1'), ('Nikita', 2, 208, '0'), ('Nikita', 1, 228, '0'), ('Nikita', 2, 148, '0');
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SELECT * FROM tab SETTINGS max_threads=1;
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DROP TABLE tab;
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