Bug 182061 Data engine changes to support result set sharing
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
* method can be used
	 */
	private void start( ) throws DataException
	{
		assert state == NOT_STARTED;
		
		
		state = BEFORE_FIRST_ROW;
		this.getRdSaveHelper( ).doSaveStart( );
	}
	
	/**
	 * Checks to make sure the iterator has started. Throws exception if it has
	 * not.
	 */
	private void checkStarted( ) throws DataException
	{
		if ( state == NOT_STARTED || state == CLOSED )
		{
			DataException e = new DataException( ResourceConstants.RESULT_CLOSED );
			logger.logp( Level.FINE,
					ResultIterator.class.getName( ),
					"checkStarted",
					"ResultIterator has been closed.",
					e );
			throw e;
		}
	}
	
	/*