mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 03:22:14 +00:00
69 lines
2.2 KiB
SQL
69 lines
2.2 KiB
SQL
SELECT '====array====';
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DROP TABLE IF EXISTS t_arr;
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CREATE TABLE t_arr (a Array(UInt32)) ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t_arr VALUES ([1]) ([]) ([1, 2, 3]) ([1, 2]);
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SYSTEM DROP MARK CACHE;
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SELECT a.size0 FROM t_arr;
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SYSTEM FLUSH LOGS;
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SELECT ProfileEvents['FileOpen']
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FROM system.query_log
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WHERE (type = 'QueryFinish') AND (lower(query) LIKE lower('SELECT a.size0 FROM %t_arr%'))
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AND current_database = currentDatabase();
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SELECT '====tuple====';
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DROP TABLE IF EXISTS t_tup;
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CREATE TABLE t_tup (t Tuple(s String, u UInt32)) ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t_tup VALUES (('foo', 1)) (('bar', 2)) (('baz', 42));
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SYSTEM DROP MARK CACHE;
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SELECT t.s FROM t_tup;
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SYSTEM DROP MARK CACHE;
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SELECT t.u FROM t_tup;
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SYSTEM FLUSH LOGS;
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SELECT ProfileEvents['FileOpen']
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FROM system.query_log
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WHERE (type = 'QueryFinish') AND (lower(query) LIKE lower('SELECT t._ FROM %t_tup%'))
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AND current_database = currentDatabase();
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SELECT '====nullable====';
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DROP TABLE IF EXISTS t_nul;
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CREATE TABLE t_nul (n Nullable(UInt32)) ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t_nul VALUES (1) (NULL) (2) (NULL);
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SYSTEM DROP MARK CACHE;
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SELECT n.null FROM t_nul;
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SYSTEM FLUSH LOGS;
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SELECT ProfileEvents['FileOpen']
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FROM system.query_log
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WHERE (type = 'QueryFinish') AND (lower(query) LIKE lower('SELECT n.null FROM %t_nul%'))
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AND current_database = currentDatabase();
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SELECT '====map====';
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SET allow_experimental_map_type = 1;
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DROP TABLE IF EXISTS t_map;
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CREATE TABLE t_map (m Map(String, UInt32)) ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t_map VALUES (map('a', 1, 'b', 2)) (map('a', 3, 'c', 4)), (map('b', 5, 'c', 6));
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--- will read 4 files: keys.bin, keys.mrk2, size0.bin, size0.mrk2
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SYSTEM DROP MARK CACHE;
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SELECT m.keys FROM t_map;
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SYSTEM DROP MARK CACHE;
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SELECT m.values FROM t_map;
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SYSTEM FLUSH LOGS;
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SELECT ProfileEvents['FileOpen']
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FROM system.query_log
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WHERE (type = 'QueryFinish') AND (lower(query) LIKE lower('SELECT m.% FROM %t_map%'))
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AND current_database = currentDatabase();
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DROP TABLE t_arr;
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DROP TABLE t_nul;
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DROP TABLE t_tup;
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DROP TABLE t_map;
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