code: @Override
      public void filterSetup() {
          int type = getIntParameter(SimpleJob.READER_TYPE);
          if (type == SimpleJob.SINGLE_COLUMN_JOIN_READER) {
              joinColumn = new String[1];
              joinColumn[0] = getStringParameter(SimpleJob.JOIN_MASTER_COLUMN);
          } else if (type == SimpleJob.SOME_COLUMN_JOIN_READER) {
              joinColumn = getStringsParameter(SimpleJob.JOIN_MASTER_COLUMN);
          }
          masterLabels = getStringsParameter(SimpleJob.MASTER_LABELS);
      }
docs: {@inheritDoc}