Accum in array with relation values got from SELECT

relation_array_accum.sql

SELECT DISTINCT 
  schedule_groups.id,
  schedule_groups.description,
  schedule_groups.groups_id,
  array_agg(groups.id), 
  array_to_string(
    ARRAY(
      SELECT DISTINCT * FROM unnest(
        array_accum(
          ARRAY(
            SELECT kls_modes.short_name_rus 
            FROM kls_modes 
            WHERE kls_modes.id = ANY(groups.work_mode_id)
          )
        )
      )
    ), 
    ', ') 
FROM schedule_groups 
INNER JOIN groups ON groups.id = ANY(schedule_groups.groups_id) 
GROUP BY schedule_groups.id ORDER BY schedule_groups.id