docs: public GetRelationalDatabasesResult withRelationalDatabases(RelationalDatabase... relationalDatabases) {
          if (this.relationalDatabases == null) {
              setRelationalDatabases(new java.util.ArrayList<RelationalDatabase>(relationalDatabases.length));
          }
          for (RelationalDatabase ele : relationalDatabases) {
              this.relationalDatabases.add(ele);
          }
          return this;
      }