L, it is assumed to be a "background" thread.
--
-- mysql> select * from host_summary_by_statement_type;
-- +------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
-- | host | statement            | total  | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |
-- +------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
-- | hal  | create_view          |   2063 | 00:05:04.20   | 463.58 ms   | 1.42 s       |         0 |             0 |             0 |          0 |
-- | hal  | select               |    174 | 40.87 s       | 28.83 s     | 858.13 ms    |      5212 |        157022 |             0 |         82 |
-- | hal  | stmt                 |   6645 | 15.31 s       | 491.78 ms   | 0 ps         |         0 |             0 |          7951 |          0 |
-- | hal  | call_procedure       |     17 | 4.78 s        | 1.02 s      | 37.94 ms     |         0 |             0 |            19 |          0 |
-- | hal  | create_table         |     19 | 3.04 s        | 431.71 ms   | 0 ps         |         0 |             0 |             0 |          0 |
-- ...
-- +------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
--
CREATE OR REPLACE
  ALGORITHM = MERGE
  DEFINER = 'mysql.sys'@'localhost'
  SQL SECURITY INVOKER 
VIEW host_summary_by_statement_type (
  host,
  statement,
  total,
  total_latency,
  max_latency,
  lock_latency,
  cpu_latency,
  rows_sent,
  rows_examined,
  rows_affected,
  full_scans
) AS
SELECT IF(host IS NULL, 'background', host) AS host,
       SUBSTRING_INDEX(event_name, '/', -1) AS statement,
       count_star AS total,
       format_pico_time(sum_timer_wait) AS total_latency,
       format_pico_time(max_timer_wait) AS max_latency,
       format_pico_time(sum_lock_time) AS lock_latency,
       format_pico_time(sum_cpu_time) AS cpu_latency,
       sum_rows_sent AS rows_sent,
       sum_rows_examined AS rows_examined,
       sum_rows_affected AS rows_affected,
       sum_no_index_used + sum_no_good_index_used AS full_scans
  FROM performance_schema.events_statements_summary_by_host_by_event_name
 WHERE sum_timer_wait != 0
 ORDER BY IF(host IS NULL, 'background', host), sum_timer_wait DESC;