Bug 204229 [Automation][Regression]Exception is thrown when preview reportdesign in webviewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/util/ExprDataReader2.java
if ( hasNext )
		{
			this.nextDestIndex = getNextDestIndex( currRowIndex );
			this.rowIDMap.set( currRowIndex, new Integer( nextDestIndex ) );
		}
		return hasNext;
	}
	
	/**
	 *
	 */
	protected int getNextDestIndex( int currIndex )
	{
		return rowIndexUtil.read( );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IExprResultReader#getRowValue()
	 */
	public Map getRowValue( ) throws DataException
	{
		try
		{
			if ( this.rowCount == 0 )
			{
				if ( this.exprValueMap == null )
					this.exprValueMap = this.getValueMap( );
			}
			else
			{