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35 lines
1.1 KiB
MySQL
35 lines
1.1 KiB
MySQL
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DROP TABLE IF EXISTS t_sparse;
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CREATE TABLE t_sparse (id UInt64, u UInt64, s String, arr1 Array(String), arr2 Array(UInt64))
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ENGINE = MergeTree ORDER BY tuple()
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SETTINGS min_bytes_for_wide_part = 0, ratio_for_sparse_serialization = 0.1;
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INSERT INTO t_sparse SELECT
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number,
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if (number % 10 = 0, number, 0),
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if (number % 5 = 0, toString(number), ''),
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if (number % 7 = 0, arrayMap(x -> toString(x), range(number % 10)), []),
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if (number % 12 = 0, range(number % 10), [])
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FROM numbers (200);
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SELECT column, serialization_kind FROM system.parts_columns
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WHERE table = 't_sparse' AND database = currentDatabase()
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ORDER BY column;
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SELECT * FROM t_sparse WHERE u != 0 ORDER BY id;
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SELECT '===========';
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SELECT * FROM t_sparse WHERE s != '' ORDER BY id;
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SELECT '===========';
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SELECT * FROM t_sparse WHERE arr1 != [] ORDER BY id;
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SELECT '===========';
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SELECT * FROM t_sparse WHERE arr2 != [] ORDER BY id;
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SELECT sum(u) FROM t_sparse;
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SELECT sum(u) FROM t_sparse GROUP BY id % 7;
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SELECT '===========';
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SELECT arrayFilter(x -> x % 2 = 1, arr2) FROM t_sparse WHERE arr2 != [] LIMIT 5;
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DROP TABLE t_sparse;
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