Learn CompoundExpression in supersonic.

hello2013.cc

static void LearnCompoundExpression() {
  scoped_ptr<CompoundExpression> tuple(new CompoundExpression());
  tuple->AddAs("from", ConstString("Supersonic: "));
  tuple->AddAs("say",
      If(Less(ConstInt32(28), ConstInt32(29)),
        ConstString("Hello"),
        ConstString("World")));
  tuple->AddAs("comma", ConstString(","));
  tuple->AddAs("new", Plus(ConstInt32(2012), ConstInt32(1)));
  scoped_ptr<Operation> compute(Compute(tuple.release(), Generate(10)));
  scoped_ptr<Cursor> cursor(SucceedOrDie(compute->CreateCursor()));
  scoped_ptr<ResultView> result(new ResultView(cursor->Next(-1)));
  if (result->has_data()) {
    const View& view = result->view();
    cout << view.schema().GetHumanReadableSpecification() << endl;
    for (int i = 0; i < view.row_count(); i++) {
      cout << view.column(0).typed_data<STRING>()[i]
           << view.column(1).typed_data<STRING>()[i]
           << view.column(2).typed_data<STRING>()[i]
           << view.column(3).typed_data<INT32>()[i]
           << endl;
    }
  }
}