truncate table performance_schema.events_statements_history_long;
truncate table performance_schema.events_stages_history_long;
drop table if exists t0, t1;
select * from performance_schema.setup_instruments where name like '%show_explain%';
NAME	ENABLED	TIMED
wait/synch/cond/sql/show_explain	YES	YES
stage/sql/Show explain	YES	YES
statement/sql/show_explain	YES	YES
# We've got no instances
select * from performance_schema.cond_instances where name like '%show_explain%';
NAME	OBJECT_INSTANCE_BEGIN
# Check out if our cond is hit.
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
connect  con1, localhost, root,,;
connection con1;
connection default;
connection con1;
set @show_explain_probe_select_id=1;
set debug_dbug='d,show_explain_probe_join_exec_start';
select count(*) from t0 where a < 100000;
connection default;
show explain for $thr2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
Warnings:
Note	1003	select count(*) from t0 where a < 100000
connection con1;
count(*)
10
set debug_dbug='';
select event_name
from
performance_schema.events_stages_history_long
where
event_name like '%show explain' and
thread_id in(select thread_id
from performance_schema.events_statements_history_long
where EVENT_NAME='statement/sql/show_explain');
event_name
stage/sql/Show explain
drop table t0;