-- source include/have_query_cache.inc

--echo #
--echo # MDEV-4520: Assertion `0' fails in Query_cache::end_of_result on
--echo # concurrent drop event and event execution
--echo #
set @save_query_cache_size=@@query_cache_size;
set GLOBAL query_cache_size=1355776;

create user mysqltest1@localhost;
grant SELECT on test.* to mysqltest1@localhost;

create table t1 (a int);

connect (con1,localhost,mysqltest1,,);
connection con1;
--echo # This explain put here to be sure that init connection query
--echo # has 'Impossible WHERE'.
explain extended select * from test.t1 where 0;
connection default;
disconnect con1;
revoke all privileges, grant option from mysqltest1@localhost;
drop user mysqltest1@localhost;

drop table t1;

set GLOBAL query_cache_size=@save_query_cache_size;