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ab8fe68571
Co-authored-by: SmitaRKulkarni <Smita.Kulkarni@clickhouse.com>
25 lines
1.1 KiB
SQL
25 lines
1.1 KiB
SQL
DROP TABLE IF EXISTS test_apply_deleted_mask;
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CREATE TABLE test_apply_deleted_mask(id Int64, value String) ENGINE = MergeTree ORDER BY id;
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INSERT INTO test_apply_deleted_mask SELECT number, number::String FROM numbers(5);
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DELETE FROM test_apply_deleted_mask WHERE id % 2 = 0;
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SELECT 'Normal SELECT does not see deleted rows';
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SELECT *, _row_exists FROM test_apply_deleted_mask;
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SELECT 'With the setting disabled the deleted rows are visible';
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SELECT *, _row_exists FROM test_apply_deleted_mask SETTINGS apply_deleted_mask = 0;
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SELECT 'With the setting disabled the deleted rows are visible but still can be filterd out';
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SELECT * FROM test_apply_deleted_mask WHERE _row_exists SETTINGS apply_deleted_mask = 0;
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INSERT INTO test_apply_deleted_mask SELECT number, number::String FROM numbers(5, 1);
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OPTIMIZE TABLE test_apply_deleted_mask FINAL SETTINGS mutations_sync=2;
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SELECT 'Read the data after OPTIMIZE, all deleted rwos should be physically removed now';
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SELECT *, _row_exists FROM test_apply_deleted_mask SETTINGS apply_deleted_mask = 0;
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DROP TABLE test_apply_deleted_mask; |