class ColumnAggregation {

  @Override
  public boolean equals(@Nullable Object obj) {
    if (this == obj) {
      return true;
    }
    if (!(obj instanceof ColumnAggregation)) {
      return false;
    }
    ColumnAggregation rhs = (ColumnAggregation) obj;
    return _aggregation == rhs._aggregation && _column.equals(rhs._column);
  }

  public  ColumnAggregation(@Nonnull Aggregation aggregation, @Nonnull String column);

}