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
* @return filter array
		 */
		private ArrayList createFilters( Iterator iter )
		{
			ArrayList filters = new ArrayList( );
			if ( iter != null )
			{
				while ( iter.hasNext( ) )
				{
					FilterConditionHandle filterHandle = (FilterConditionHandle) iter
							.next( );
					IFilterDefinition filter = createFilter( filterHandle );
					filters.add( filter );
				}
			}
			return filters;
		}
		/**
		 * create filter array given a Listing design element
		 * 
		 * @param listing
		 *            the ListingDesign
		 * @return the filter array
		 */
		public ArrayList createFilters( ListingDesign listing )
		{
			return createFilters( ( (ListingHandle) listing.getHandle( ) )
					.filtersIterator( ) );
		}
		/**