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.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ExpressionUtil.java
public IColumnBinding[] getColumnBindings( )
	{
		IColumnBinding[] result = new ColumnBinding[columnBindings.size()];
		for ( int i = 0; i < result.length; i++ )
		{
			result[i] = (IColumnBinding) columnBindings.get( i );
		}
		return result;
	}
	
	public void addNewExpression( String expr )
	{
		this.newExprs.add( expr );
	}
	public void addColumnBindings( List columnBindingList )
	{
		for( int i = 0; i < columnBindingList.size( ); i++ )
		{
			if( !this.columnBindings.contains( columnBindingList.get( i ) ))
			{
				this.columnBindings.add( columnBindingList.get( i ) );
			}
		}
	}
}
/**
 * A utility class for internal use only.
 * 
 */
class ParseIndicator