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/PreparedQuery.java
* @param subQueryName
	 * @return
	 */
	ISubqueryDefinition getSubQueryDefn( String subQueryName )
	{
		return (ISubqueryDefinition) ( (Object[]) subQueryDefnMap.get( subQueryName ) )[0];
	}
	
	/**
	 * @param subQueryName
	 * @return
	 */
	int getSubQueryLevel( String subQueryName )
	{
		return ( (Integer) ( (Object[]) subQueryDefnMap.get( subQueryName ) )[1] ).intValue( );
	}
	
	/**
	 * Executes a subquery
	 * 
	 * @param iterator
	 * @param subQueryName
	 * @param subScope
	 * @return
	 * @throws DataException
	 */
	QueryResults execSubquery( IResultIterator iterator, String subQueryName,
			Scriptable subScope ) throws DataException
	{
		assert subQueryName != null;