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https://github.com/ClickHouse/ClickHouse.git
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134 lines
4.1 KiB
SQL
134 lines
4.1 KiB
SQL
-- TEST CACHE
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CREATE TABLE t1 (i Int64, j Int64) ENGINE = Memory;
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INSERT INTO t1 SELECT number, number FROM system.numbers LIMIT 100;
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CREATE TABLE t2 (k Int64, l Int64, m Int64, n Int64) ENGINE = Memory;
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CREATE MATERIALIZED VIEW mv1 TO t2 AS
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WITH
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(SELECT max(i) FROM t1) AS t1
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SELECT
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t1 as k, -- Using local cache x 4
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t1 as l,
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t1 as m,
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t1 as n
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FROM t1
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LIMIT 5;
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-- FIRST INSERT
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INSERT INTO t1
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WITH
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(SELECT max(i) FROM t1) AS t1
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SELECT
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number as i,
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t1 + t1 + t1 AS j -- Using global cache
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FROM system.numbers
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LIMIT 100
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SETTINGS
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min_insert_block_size_rows=5,
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max_insert_block_size=5,
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min_insert_block_size_rows_for_materialized_views=5,
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max_block_size=5,
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max_threads=1;
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SELECT k, l, m, n, count()
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FROM t2
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GROUP BY k, l, m, n
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ORDER BY k, l, m, n;
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SYSTEM FLUSH LOGS;
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-- The main query should have a cache miss and 3 global hits
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-- The MV is executed 20 times (100 / 5) and each run does 1 miss and 4 hits to the LOCAL cache
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-- In addition to this, to prepare the MV, there is an extra preparation to get the list of columns via
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-- InterpreterSelectQuery, which adds 1 miss and 4 global hits (since it uses the global cache)
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-- So in total we have:
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-- Main query: 1 miss, 3 global
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-- Preparation: 1 miss, 4 global
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-- Blocks (20): 20 miss, 0 global, 80 local hits
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-- TOTAL: 22 miss, 7 global, 80 local
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SELECT
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'02177_MV',
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ProfileEvents['ScalarSubqueriesGlobalCacheHit'] as scalar_cache_global_hit,
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ProfileEvents['ScalarSubqueriesLocalCacheHit'] as scalar_cache_local_hit,
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ProfileEvents['ScalarSubqueriesCacheMiss'] as scalar_cache_miss
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FROM system.query_log
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WHERE
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current_database = currentDatabase()
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AND type = 'QueryFinish'
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AND query LIKE '-- FIRST INSERT\nINSERT INTO t1\n%'
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AND event_date >= yesterday() AND event_time > now() - interval 10 minute;
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DROP TABLE mv1;
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CREATE TABLE t3 (z Int64) ENGINE = Memory;
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CREATE MATERIALIZED VIEW mv2 TO t3 AS
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SELECT
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-- This includes an unnecessarily complex query to verify that the local cache is used (since it uses t1)
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sum(i) + sum(j) + (SELECT * FROM (SELECT min(i) + min(j) FROM (SELECT * FROM system.one _a, t1 _b))) AS z
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FROM t1;
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-- SECOND INSERT
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INSERT INTO t1
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SELECT 0 as i, number as j from numbers(100)
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SETTINGS
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min_insert_block_size_rows=5,
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max_insert_block_size=5,
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min_insert_block_size_rows_for_materialized_views=5,
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max_block_size=5,
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max_threads=1;
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SELECT * FROM t3 ORDER BY z ASC;
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SYSTEM FLUSH LOGS;
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SELECT
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'02177_MV_2',
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ProfileEvents['ScalarSubqueriesGlobalCacheHit'] as scalar_cache_global_hit,
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ProfileEvents['ScalarSubqueriesLocalCacheHit'] as scalar_cache_local_hit,
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ProfileEvents['ScalarSubqueriesCacheMiss'] as scalar_cache_miss
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FROM system.query_log
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WHERE
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current_database = currentDatabase()
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AND type = 'QueryFinish'
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AND query LIKE '-- SECOND INSERT\nINSERT INTO t1%'
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AND event_date >= yesterday() AND event_time > now() - interval 10 minute;
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DROP TABLE mv2;
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CREATE TABLE t4 (z Int64) ENGINE = Memory;
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CREATE MATERIALIZED VIEW mv3 TO t4 AS
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SELECT
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-- This includes an unnecessarily complex query but now it uses t2 so it can be cached
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min(i) + min(j) + (SELECT * FROM (SELECT min(k) + min(l) FROM (SELECT * FROM system.one _a, t2 _b))) AS z
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FROM t1;
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-- THIRD INSERT
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INSERT INTO t1
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SELECT number as i, number as j from numbers(100)
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SETTINGS
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min_insert_block_size_rows=5,
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max_insert_block_size=5,
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min_insert_block_size_rows_for_materialized_views=5,
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max_block_size=5,
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max_threads=1;
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SYSTEM FLUSH LOGS;
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SELECT * FROM t4 ORDER BY z ASC;
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SELECT
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'02177_MV_3',
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ProfileEvents['ScalarSubqueriesGlobalCacheHit'] as scalar_cache_global_hit,
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ProfileEvents['ScalarSubqueriesLocalCacheHit'] as scalar_cache_local_hit,
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ProfileEvents['ScalarSubqueriesCacheMiss'] as scalar_cache_miss
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FROM system.query_log
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WHERE
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current_database = currentDatabase()
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AND type = 'QueryFinish'
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AND query LIKE '-- THIRD INSERT\nINSERT INTO t1%'
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AND event_date >= yesterday() AND event_time > now() - interval 10 minute;
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DROP TABLE mv3;
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DROP TABLE t1;
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DROP TABLE t2;
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DROP TABLE t3;
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DROP TABLE t4;
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