Method atomic_subselect

expr.cc:278–317

}

atomic_subselect::atomic_subselect(prod *p, sqltype *type_constraint)
  : value_expr(p), offset((d6() == 6) ? d100() : d6())
{
  match();
  if (d6() < 3) {
    if (type_constraint) {
      auto idx = scope->schema->aggregates_returning_type;
      auto iters = idx.equal_range(type_constraint);
      agg = random_pick(random_pick(iters)->second);
    } else {
      agg = &random_pick<>(scope->schema->aggregates);
    }
    if (agg->argtypes.size() != 1)
      agg = 0;
    else
      type_constraint = agg->argtypes[0];
  } else {
    agg = 0;
  }

  if (type_constraint) {
    auto idx = scope->schema->tables_with_columns_of_type;
    col = 0;
    auto iters = idx.equal_range(type_constraint);
    tab = random_pick(random_pick(iters)->second);

    for (auto &cand : tab->columns()) {
      if (type_constraint->consistent(cand.type)) {
	col = &cand;
	break;
      }
    }
    assert(col);
  } else {
    tab = &random_pick<>(scope->schema->tables);
    col = &random_pick<>(tab->columns());
  }

  type = agg ? agg->restype : col->type;
}

void atomic_subselect::out(std::ostream &out)
{