Bug 141064 Remove group level data binding
This bug covers the engine part of the task to remove group level data binding. After the hange, all binding expressions will be defined on the table level, and each binding expression will have an AggregateOn field to explicitly define the group level for that expression.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
*/
		public Object visitMultiLineItem( MultiLineItemDesign multiLine,
				Object value )
		{
			BaseQueryDefinition query = prepareVisit( multiLine );
			finishVisit( query );
			return value;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.engine.ir.IReportItemVisitor#visitDataItem(org.eclipse.birt.report.engine.ir.DataItemDesign)
		 */
		public Object visitDataItem( DataItemDesign data, Object value )
		{
			BaseQueryDefinition query = prepareVisit( data );
			finishVisit( query );
			return value;
		}
		/**
		 * @param band
		 *            the list band
		 */
		protected void visitListBand( ListBandDesign band, Object value )
		{
			for ( int i = 0; i < band.getContentCount( ); i++ )
			{
				band.getContent( i ).accept( this, value );
			}
		}