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31 lines
960 B
SQL
31 lines
960 B
SQL
DROP TABLE IF EXISTS t_sparse_mutation;
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CREATE TABLE t_sparse_mutation (id UInt64, v UInt64)
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ENGINE = MergeTree ORDER BY id
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SETTINGS ratio_of_defaults_for_sparse_serialization = 0.9;
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INSERT INTO t_sparse_mutation select number, if (number % 21 = 0, number, 0) FROM numbers(10000);
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SET mutations_sync = 2;
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DELETE FROM t_sparse_mutation WHERE id % 2 = 0;
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SELECT count(), sum(v) FROM t_sparse_mutation;
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SELECT sum(has_lightweight_delete) FROM system.parts
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WHERE database = currentDatabase() AND table = 't_sparse_mutation' AND active;
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ALTER TABLE t_sparse_mutation UPDATE v = v * 2 WHERE id % 5 = 0;
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ALTER TABLE t_sparse_mutation DELETE WHERE id % 3 = 0;
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SELECT count(), sum(v) FROM t_sparse_mutation;
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OPTIMIZE TABLE t_sparse_mutation FINAL;
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SELECT sum(has_lightweight_delete) FROM system.parts
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WHERE database = currentDatabase() AND table = 't_sparse_mutation' AND active;
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SELECT count(), sum(v) FROM t_sparse_mutation;
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DROP TABLE t_sparse_mutation;
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