src/Squid/MySql/Extensions/Combine/Select/SelectCombiner.php
public function queryExists()
	{
		foreach ($this->selects as $select)
		{
			$result = $select->queryExists();

			if (is_null($result) || $result)
			{
				return $result;
			}
		}

		return false;
	}
public function queryExists()
	{
		foreach ($this->selects as $select)
		{
			$result = $select->queryExists();

			if (is_null($result) || $result)
			{
				return $result;
			}
		}

		return false;
	}
Execute a SELECT EXISTS On each query. Will stop when at least one query returns true.
@return bool|null Null on error