Bug 147977 Chart editor does not use container's column bindings
1) create data source 2) create data set: select * from customers 3) create table 4) bind country, customer name to table 5) group by country 6) create a binding for total_by_country which aggregates # of customers in each country. put a data element in group footer and bind to total_by_country 7) in group header put chart 8) in data tab specify inherit from container Result: You see columns for report data set created in step 2. Expected Result: Just 3 columns for the 3 bindings created in 4 and 6.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/GroupDefnUtil.java
* @param groupDefn2
	 * @return
	 */
	public static boolean isEqualGroups( List list1, List list2 )
	{
		if ( list1 == list2 )
			return true;
		if ( list1 == null || list2 == null )
			return false;
		if ( list1.size( ) != list2.size( ) )
			return false;
		for ( int i = 0; i < list1.size( ); i++ )
			if ( isEqualGroup( (IGroupDefinition) list1.get( i ),
					(IGroupDefinition) list2.get( i ) ) == false )
				return false;
		return true;
	}
	
	/**
	 * @param filterDefn1
	 * @param filterDefn2
	 * @return
	 */
	private static boolean isEqualGroup( IGroupDefinition groupDefn1,
			IGroupDefinition groupDefn2 )
	{
		if ( groupDefn1 == groupDefn2 )
			return true;
		if ( groupDefn1 == null || groupDefn2 == null )
			return false;