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
{
			int size = IOUtil.readInt( inputStream );
			for ( int i = 0; i < size; i++ )
			{
				GroupDefinition groupDefn = new GroupDefinition( IOUtil.readString( dis ));
				String keyColumn = IOUtil.readString( dis );
				String keyExpr = IOUtil.readString( dis );
				if ( keyColumn != null )
					groupDefn.setKeyColumn( keyColumn );
				else
					groupDefn.setKeyExpression( keyExpr );
				groupDefn.setInterval( IOUtil.readInt( dis ) );
				groupDefn.setIntervalRange( IOUtil.readDouble( dis ) );
				groupDefn.setSortDirection( IOUtil.readInt( dis ) );
				groupDefn.getFilters( ).addAll( FilterDefnUtil.loadFilterDefn( dis ) );
				groupDefn.getSorts( ).addAll( QueryDefnUtil.loadSorts( dis ) );
				groupDefn.getSubqueries( )
						.addAll( QueryDefnUtil.loadSubQuery( dis ) );
				groupList.add( groupDefn );
			}
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_LOAD_ERROR, e );
		}
		return groupList;
	}
	
	/**
	 * @param groupDefn1