help.sql

MERGE INTO register.external_role_assignment era USING (
  SELECT
    p_from_party from_party,
    p_source "source",
    a.to_party,
    a.identifier
  FROM
    unnest(p_assignments) a
) upd ON era.from_party = upd.from_party
AND era.to_party = upd.to_party
AND era."source" = upd."source"
AND era.identifier = upd.identifier WHEN NOT MATCHED BY SOURCE THEN DELETE WHEN NOT MATCHED BY TARGET THEN INSERT ("source", identifier, from_party, to_party)
VALUES
  (
    upd."source",
    upd.identifier,
    upd.from_party,
    upd.to_party
  )
RETURNING
  CASE
    WHEN merge_action () = 'INSERT' THEN 'added'::register.external_role_assignment_event_type
    WHEN merge_action () = 'DELETE' THEN 'removed'::register.external_role_assignment_event_type
  END "type",
  COALESCE(era.to_party, upd.to_party) to_party,
  COALESCE(era.identifier, upd.identifier) identifier