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65 lines
3.0 KiB
SQL
65 lines
3.0 KiB
SQL
-- Tags: no-parallel
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-- Tag no-parallel: Messes with internal cache
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SYSTEM DROP QUERY CACHE;
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SELECT 'The Default for query_cache_system_table_handling is = throw';
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-- Test that the query cache rejects queries that involve system tables.
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SELECT * FROM system.one SETTINGS use_query_cache = 1; -- { serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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SELECT count(*) FROM system.query_cache;
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SYSTEM DROP QUERY CACHE;
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SELECT 'Check behavior of query_cache_system_table_handling = throw';
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-- Test that the query cache rejects queries that involve system tables.
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SELECT * FROM system.one SETTINGS use_query_cache = 1, query_cache_system_table_handling = 'throw'; -- { serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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SELECT count(*) FROM system.query_cache;
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SYSTEM DROP QUERY CACHE;
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SELECT 'Check behavior of query_cache_system_table_handling = save';
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-- Test that the query cache saves the result of queries that involve system tables.
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SELECT * FROM system.one SETTINGS use_query_cache = 1, query_cache_system_table_handling = 'save';
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SELECT count(*) FROM system.query_cache;
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SYSTEM DROP QUERY CACHE;
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SELECT 'Check behavior of query_cache_system_table_handling = ignore';
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-- Test that the query cache ignores the result of queries that involve system tables.
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SELECT * FROM system.one SETTINGS use_query_cache = 1, query_cache_system_table_handling = 'ignore';
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SELECT count(*) FROM system.query_cache;
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SYSTEM DROP QUERY CACHE;
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SELECT 'Other tests';
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-- Edge case which doesn't work well due to conceptual reasons (QueryCache is AST-based), test it anyways to have it documented.
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USE system;
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SELECT * FROM one SETTINGS use_query_cache = 1; -- doesn't throw but should
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-- This query uses system.zero internally. Since the query cache works at AST level it does not "see' system.zero and must not complain.
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SELECT * SETTINGS use_query_cache = 1;
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-- information_schema is also treated as a system table
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SELECT * FROM information_schema.tables SETTINGS use_query_cache = 1; -- { serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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SELECT * FROM INFORMATION_SCHEMA.TABLES SETTINGS use_query_cache = 1; -- { serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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-- System tables can be "hidden" inside e.g. table functions
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SELECT * FROM clusterAllReplicas('test_shard_localhost', system.one) SETTINGS use_query_cache = 1; -- {serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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SELECT * FROM clusterAllReplicas('test_shard_localhost', 'system.one') SETTINGS use_query_cache = 1; -- {serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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-- Criminal edge case that a user creates a table named "system". The query cache must not reject queries against it.
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DROP TABLE IF EXISTS system;
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CREATE TABLE system (c UInt64) ENGINE = Memory;
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SElECT * FROM system SETTINGS use_query_cache = 1;
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DROP TABLE system;
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-- Similar queries against system.system are rejected.
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DROP TABLE IF EXISTS system.system;
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CREATE TABLE system.system (c UInt64) ENGINE = Memory;
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SElECT * FROM system.system SETTINGS use_query_cache = 1; -- { serverError QUERY_CACHE_USED_WITH_SYSTEM_TABLE }
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DROP TABLE system;
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-- Cleanup
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SYSTEM DROP QUERY CACHE;
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