.setHashIndexes(Arrays.asList(3));
// -------------------------------------------------------------------------------------
// set up aggregation function on the same StormComponent(Bolt) where
// the last join is
final SelectOperator so = new SelectOperator(new OrPredicate(new AndPredicate(
new ComparisonPredicate(new ColumnReference(_sc, 0), new ValueSpecification(_sc,
_firstCountryName)), new ComparisonPredicate(new ColumnReference(_sc, 2),
new ValueSpecification(_sc, _secondCountryName))), new AndPredicate(
new ComparisonPredicate(new ColumnReference(_sc, 0), new ValueSpecification(_sc,
_secondCountryName)), new ComparisonPredicate(new ColumnReference(_sc, 2),
new ValueSpecification(_sc, _firstCountryName)))));
final AggregateOperator agg = new AggregateSumOperator(new ColumnReference(_doubleConv, 4),