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47 lines
1.8 KiB
SQL
47 lines
1.8 KiB
SQL
DROP TABLE IF EXISTS in_memory;
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CREATE TABLE in_memory (a UInt32, b UInt32)
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ENGINE = MergeTree ORDER BY a
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SETTINGS min_rows_for_compact_part = 1000, min_rows_for_compact_part = 1000;
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INSERT INTO in_memory SELECT number, number % 3 FROM numbers(100);
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SELECT 'system.parts';
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SELECT DISTINCT part_type, marks FROM system.parts WHERE database = currentDatabase() AND table = 'in_memory' AND active;
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SELECT DISTINCT data_uncompressed_bytes > 0 FROM system.parts WHERE database = currentDatabase() AND table = 'in_memory' AND active;
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SELECT DISTINCT column_data_uncompressed_bytes > 0 FROM system.parts_columns WHERE database = currentDatabase() AND table = 'in_memory' AND active;
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SELECT 'Simple selects';
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SELECT * FROM in_memory ORDER BY a LIMIT 5;
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SELECT * FROM in_memory ORDER BY a LIMIT 5 OFFSET 50;
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SELECT count() FROM in_memory WHERE b = 0 SETTINGS max_block_size = 10;
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-- Check index
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SELECT count() FROM in_memory WHERE a > 100 SETTINGS max_rows_to_read = 0, force_primary_key = 1;
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SELECT count() FROM in_memory WHERE a >= 10 AND a < 30 SETTINGS force_primary_key = 1;
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SELECT DISTINCT blockSize() FROM in_memory SETTINGS max_block_size = 10;
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SELECT 'Mutations and Alters';
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SET mutations_sync = 1;
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ALTER TABLE in_memory DELETE WHERE b = 0;
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SELECT count() FROM in_memory;
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SELECT * FROM in_memory ORDER BY a LIMIT 5;
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ALTER TABLE in_memory ADD COLUMN arr Array(UInt64);
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ALTER TABLE in_memory UPDATE arr = [a, a * a] WHERE b = 1;
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SELECT arr FROM in_memory ORDER BY a LIMIT 5;
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ALTER TABLE in_memory MODIFY COLUMN b String;
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ALTER TABLE in_memory RENAME COLUMN b to str;
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SELECT DISTINCT str, length(str) FROM in_memory ORDER BY str;
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ALTER TABLE in_memory DROP COLUMN str;
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SELECT * FROM in_memory ORDER BY a LIMIT 5;
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-- in-memory parts works if they're empty.
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ALTER TABLE in_memory DELETE WHERE 1;
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SELECT count() FROM in_memory;
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DROP TABLE in_memory;
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