drop table if exists t0,t1;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
explain select * from t0 where a < 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
# 
# MDEV-5045: Server crashes in QPF_query::print_explain with log_slow_verbosity='query_plan,explain'
# 
set autocommit=1;
drop table t0;
# 
# MDEV-5047 virtual THD::~THD(): Assertion `status_var.memory_used == 0' fails on disconnect
# 
ALTER TABLE nonexisting ENABLE KEYS;
ERROR 42S02: Table 'test.nonexisting' doesn't exist
SHOW WARNINGS;
Level	Code	Message
Error	1146	Table 'test.nonexisting' doesn't exist
SELECT 1;
1
1