Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ExprManager.java
groupLevel,
					resultsExprMap ) );
		}
		finally
		{
			Context.exit( );
		}
	}
	/**
	 * @param name
	 * @param baseExpr
	 */
	void addAutoBindingExpr( String name, IBaseExpression baseExpr )
	{
		autoBindingExprMap.put( name, baseExpr );
	}
	/**
	 * @param name
	 * @return expression for specified name
	 * @throws DataException 
	 */
	public IBaseExpression getExpr( String name ) throws DataException
	{
		IBaseExpression baseExpr = getBindingExpr( name );
		if ( baseExpr == null )
			baseExpr = getAutoBindingExpr( name );
		return baseExpr;
	}
	/**
	 *