Bug 212375 [Automation][Regression]Exception occurs when preview a outputParams["xxx"]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedDataSourceQuery.java
*/
	public IQueryResults execute( Scriptable scope ) throws DataException
	{
		return this.execute( null, scope );
	}
	/**
	 * Executes the prepared execution plan as an inner query that appears
	 * within the scope of another report query. The outer query must have been
	 * prepared and executed, and its results given as a parameter to this
	 * method.
	 * 
	 * @param outerResults
	 *            QueryResults for the executed outer query
	 * @return The QueryResults object opened and ready to return the results of
	 *         a report query.
	 */
	public IQueryResults execute( IQueryResults outerResults, Scriptable scope )
			throws DataException
	{
		return this.execute( (IBaseQueryResults)outerResults, scope );
	}
	
	/**
	 * 
	 * @param outerResults
	 * @param scope
	 * @return
	 * @throws DataException
	 */
	public IQueryResults execute( IBaseQueryResults outerResults, Scriptable scope ) throws DataException