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/ExprDataReader1.java
/*
	 * @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 if ( currReadIndex < currRowIndex + 1 )
			{
				this.skipTo( currRowIndex );
				this.exprValueMap = this.getValueMap( );
			}
			currReadIndex = currRowIndex + 1;
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_LOAD_ERROR,
					e,
					"Result Data" );
		}
		return exprValueMap;
	}
	/**
	 * @param absoluteRowIndex
	 * @throws IOException