Bug 192829 Aggregation binding filter doesn't work for crosstab
The filter condition on bindings for Crosstab doesn't take effect. Currently Dte hasn't supported this yet.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/impl/facttable/FactTableAccessor.java
this.position = this.diskPostion;
		}
	}
	
	private IDiskArray getSortedDimensionKeys( IDiskArray members )
			throws IOException
	{
		DiskSortedStack sortedStack = new DiskSortedStack( Constants.FACT_TABLE_BUFFER_SIZE,
				true,
				false,
				DimensionKey.getCreator( ) );
		for ( int i = 0; i < members.size( ); i++ )
		{
			sortedStack.push( members.get( i ) );
		}
		IDiskArray resultArray = new BufferedStructureArray( DimensionKey.getCreator( ),
				Constants.LIST_BUFFER_SIZE );
		Object key = sortedStack.pop( );
		while( key != null )
		{
			resultArray.add( key );
			key = sortedStack.pop( );
		}
		return resultArray;
	}
	/**
	 * Find dimension position by dimension key.
	 * 
	 * @param key
	 * @return