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MDEV-29028 Queries using RANDOM_BYTES get stored in query cache

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Mark the RANDOM_BYTES function as uncacheable.
This commit is contained in:
Daniel Black
2022-07-06 14:14:53 +10:00
committed by Sergei Golubchik
parent 8b9ac5bfe0
commit a95268c5b3
3 changed files with 58 additions and 0 deletions
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32
mysql-test/main/query_cache.test
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@ -1834,3 +1834,35 @@ DROP TABLE t;
--echo restore defaults
SET GLOBAL query_cache_type= default;
SET GLOBAL query_cache_size=@save_query_cache_size;
--echo #
--echo # MDEV-29028: Queries using RANDOM_BYTES get stored in query cache
--echo #
set @qcache= @@global.query_cache_type;
set global query_cache_type= 1;
set query_cache_type= 1;
create table t1 (a int);
insert into t1 values (1000);
flush status;
--let $v1 = `select hex(random_bytes(a)) from t1`
select * from information_schema.global_status where variable_name in ('Qcache_inserts','Qcache_hits') order by variable_name;
--let $v2 = `select hex(random_bytes(a)) from t1`
select * from information_schema.global_status where variable_name in ('Qcache_inserts','Qcache_hits') order by variable_name;
if ($v1 == $v2) {
--echo highly improbable $v1 = $v2
}
select random_bytes(1024) = random_bytes(1024) as improbable;
# Cleanup
drop table t1;
set global query_cache_type= @qcache;
--echo #
--echo # End of 10.10 tests
--echo #