Bug 177504 Engine doesn't provide SubQuery for extended item
Engine doesn't provide SubQuery for extended item, so chart can't use container's binding to execute the query. If possible, engine could provide an option for extended item to choose whether engine could create the query, so extended item won't create SubQuery by itself.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
}
			return null;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.engine.ir.ReportItemVisitor#visitTableItem(org.eclipse.birt.report.engine.ir.TableItemDesign)
		 */
		public void handleColumn( ColumnDesign column, IBaseQueryDefinition query )
		{
			transformColumnExpressions( column, query, null );
		}
		
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.engine.ir.ReportItemVisitor#visitTableItem(org.eclipse.birt.report.engine.ir.TableItemDesign)
		 */
		public Object visitTableItem( TableItemDesign table, Object value )
		{
			BaseQueryDefinition query = createQuery( table, value );
			if ( query == null )
			{
				handleListingBand( table.getHeader( ), query, true, null );				
				
				handleListingBand( table.getFooter( ), query, true, null );
			}
			else
			{