--
-- bm_bookmarks_get_tree_sortkey/1
--
create or replace function bm_bookmarks_get_tree_sortkey(
  integer
) returns varbit as $$

declare
  p_bookmark_id    alias for $1;
begin
  return tree_sortkey from bm_bookmarks where bookmark_id = p_bookmark_id;
end;$$ language plpgsql;