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Test for primary index cache size with LowCardinality columns

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This commit is contained in:
Alexander Gololobov 2024-12-03 22:27:33 +01:00
parent c5779654e8
commit 4ccbe8f1cc
2 changed files with 49 additions and 0 deletions
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tests/queries/0_stateless/03273_primary_index_cache_low_cardinality.reference Normal file
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PrimaryIndexCacheBytes 5556
PrimaryIndexCacheFiles 1
PrimaryIndexCacheBytes 0
PrimaryIndexCacheFiles 0
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PrimaryIndexCacheBytes 5556
PrimaryIndexCacheFiles 1
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tests/queries/0_stateless/03273_primary_index_cache_low_cardinality.sql Normal file
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-- Tags: no-parallel
DROP TABLE IF EXISTS t_primary_index_cache;
SYSTEM DROP PRIMARY INDEX CACHE;
CREATE TABLE t_primary_index_cache (a LowCardinality(String), b LowCardinality(String))
ENGINE = MergeTree ORDER BY (a, b)
SETTINGS use_primary_key_cache = 1, prewarm_primary_key_cache = 1, index_granularity = 8192, index_granularity_bytes = '10M', min_bytes_for_wide_part = 0;
-- Insert will prewarm primary index cache
INSERT INTO t_primary_index_cache SELECT number%10, number%11 FROM numbers(10000);
-- Check cache size
SYSTEM RELOAD ASYNCHRONOUS METRICS;
SELECT metric, value FROM system.asynchronous_metrics WHERE metric IN ('PrimaryIndexCacheFiles', 'PrimaryIndexCacheBytes') ORDER BY metric;
SYSTEM DROP PRIMARY INDEX CACHE;
-- Check that cache is empty
SYSTEM RELOAD ASYNCHRONOUS METRICS;
SELECT metric, value FROM system.asynchronous_metrics WHERE metric IN ('PrimaryIndexCacheFiles', 'PrimaryIndexCacheBytes') ORDER BY metric;
-- Trigger index reload
SELECT max(length(a || b)) FROM t_primary_index_cache WHERE a > '1' AND b < '99' SETTINGS log_comment = '03273_reload_query';
-- Check that cache size is the same as after prewarm
SYSTEM RELOAD ASYNCHRONOUS METRICS;
SELECT metric, value FROM system.asynchronous_metrics WHERE metric IN ('PrimaryIndexCacheFiles', 'PrimaryIndexCacheBytes') ORDER BY metric;
SYSTEM FLUSH LOGS;
SELECT
ProfileEvents['LoadedPrimaryIndexFiles'],
ProfileEvents['LoadedPrimaryIndexRows'],
ProfileEvents['LoadedPrimaryIndexBytes']
FROM system.query_log
WHERE log_comment = '03273_reload_query' AND current_database = currentDatabase() AND type = 'QueryFinish'
ORDER BY event_time_microseconds;
DROP TABLE t_primary_index_cache;