array
  0 => string 'Client.company_name' (length=19)
  1 => string 'Client.relationship_user_id' (length=27)
  2 => string 'Participant.first_name' (length=22)
  3 => string 'Participant.created_by' (length=22)
  4 => string 'Job.job_name' (length=12)