mariadb/mysql-test/main/show_explain_ps.test

#
# Test how SHOW EXPLAIN is represented in performance schema
#
--source include/have_debug.inc
--source include/have_perfschema.inc
# Like all other perfschema tests, we don't work on embedded server:
--source include/not_embedded.inc

# There is a query below that selects from P_S tables.
# Remove possible history that could confuse it
truncate table performance_schema.events_statements_history_long;
truncate table performance_schema.events_stages_history_long;

--disable_warnings
drop table if exists t0, t1;
--enable_warnings

select * from performance_schema.setup_instruments where name like '%show_explain%';

--echo # We've got no instances
select * from performance_schema.cond_instances where name like '%show_explain%';

--echo # 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);

let $thr1=`select connection_id()`;
connect (con1, localhost, root,,);
connection con1;
let $thr2=`select connection_id()`;
connection default;

let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;

#
# Test SHOW EXPLAIN for simple queries
#
connection con1;
set @show_explain_probe_select_id=1;
SET @saved_dbug = @@SESSION.debug_dbug;
SET debug_dbug='d,show_explain_probe_join_exec_start';
send select count(*) from t0 where a < 100000;

connection default;
--source include/wait_condition.inc
evalp show explain for $thr2;
connection con1;
reap;

SET debug_dbug= @saved_dbug;

evalp select event_name
        from
        performance_schema.events_stages_history_long join
        performance_schema.threads using (thread_id)
        where
          event_name like '%show explain' and
          processlist_id=$thr1;

drop table t0;