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https://github.com/ClickHouse/ClickHouse.git
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185 lines
4.2 KiB
SQL
185 lines
4.2 KiB
SQL
DROP TABLE IF EXISTS lwd_test;
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CREATE TABLE lwd_test
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(
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`id` UInt64,
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`value` String
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)
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ENGINE = MergeTree
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ORDER BY id
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SETTINGS
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vertical_merge_algorithm_min_rows_to_activate = 1,
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vertical_merge_algorithm_min_columns_to_activate = 1,
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min_rows_for_wide_part = 1,
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min_bytes_for_wide_part = 1;
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INSERT INTO lwd_test SELECT number AS id, toString(number) AS value FROM numbers(10);
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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SET mutations_sync = 2;
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SET allow_experimental_lightweight_delete = 1;
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-- delete some rows using LWD
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DELETE FROM lwd_test WHERE (id % 3) = 0;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- optimize table to physically delete the rows
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OPTIMIZE TABLE lwd_test FINAL;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- delete more rows
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DELETE FROM lwd_test WHERE (id % 2) = 0;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- add another part that doesn't have deleted rows
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INSERT INTO lwd_test SELECT number AS id, toString(number+100) AS value FROM numbers(10);
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- optimize table to merge 2 parts together: the 1st has LDW rows and the 2nd doesn't have LWD rows
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-- physically delete the rows
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OPTIMIZE TABLE lwd_test FINAL;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- add another part that doesn't have deleted rows
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INSERT INTO lwd_test SELECT number AS id, toString(number+200) AS value FROM numbers(10);
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- delete more rows
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DELETE FROM lwd_test WHERE (id % 3) = 2;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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-- optimize table to merge 2 parts together, both of them have LWD rows
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-- physically delete the rows
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OPTIMIZE TABLE lwd_test FINAL;
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SELECT * FROM lwd_test ORDER BY id, value;
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SELECT name, part_type
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FROM system.parts
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name;
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SELECT name, column, type, rows
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FROM system.parts_columns
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WHERE (database = currentDatabase()) AND (table = 'lwd_test') AND active
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ORDER BY name, column;
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DROP TABLE lwd_test;
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