MDEV-4683 query start_time not reset when going to sleep

mysql-test/r/processlist.result

@@ -7,3 +7,9 @@ SELECT INFO,TIME,TIME_MS FROM INFORMATION_SCHEMA.PROCESSLIST WHERE INFO IS NULL;
 SET DEBUG_SYNC = 'now SIGNAL fill_schema_proceed';
 INFO	TIME	TIME_MS
 NULL	0	0.000
+select sleep(5);
+sleep(5)
+0
+select command, time < 5 from information_schema.processlist where id != connection_id();
+command	time < 5
+Sleep	1

mysql-test/t/processlist.test

@@ -18,5 +18,18 @@ SET DEBUG_SYNC = 'now SIGNAL fill_schema_proceed';
 
 connection con1;
 reap;
+connection default;
+
+#
+# MDEV-4683 query start_time not reset when going to sleep
+#
+
+connection con1;
+select sleep(5); #run a query that will take some time
+connection default;
+
+# verify that the time in COM_SLEEP doesn't include the query run time
+select command, time < 5 from information_schema.processlist where id != connection_id();
+
 disconnect con1;
 

sql/sql_parse.cc

@@ -1461,6 +1461,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   thd_proc_info(thd, "cleaning up");
   thd->reset_query();
   thd->command=COM_SLEEP;
+  thd->set_time();
   dec_thread_running();
   thd_proc_info(thd, 0);
   thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory