ClickHouse/tests/queries/0_stateless/02494_query_cache_nondeterministic_functions.sql
Robert Schulze 325c6bdf3d
Renaming: "Query Result Cache" --> "Query Cache"
Reasons:

- The cache will at some point store intermediate results as opposed to
  only query results. We should change the terminology now without
  having to worry about backward compat.

- Equivalent caches in MySQL (1) and Starrocks (2) are called "query
  cache".

- The new name is ca. 13.8% more catchy.

(1) https://dev.mysql.com/doc/refman/5.6/en/query-cache.html
(2) https://docs.starrocks.io/en-us/2.5/using_starrocks/query_cache
2023-01-31 09:54:34 +00:00

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SQL

-- Tags: no-parallel
-- Tag no-parallel: Messes with internal cache
SET allow_experimental_query_cache = true;
SYSTEM DROP QUERY CACHE;
-- rand() is non-deterministic, with default settings no entry in the query cache should be created
SELECT COUNT(rand(1)) SETTINGS use_query_cache = true;
SELECT COUNT(*) FROM system.query_cache;
SELECT '---';
-- But an entry can be forced using a setting
SELECT COUNT(RAND(1)) SETTINGS use_query_cache = true, query_cache_store_results_of_queries_with_nondeterministic_functions = true;
SELECT COUNT(*) FROM system.query_cache;
SYSTEM DROP QUERY CACHE;