void addBindingExpr( String groupKey, Map resultsExprMap, int groupLevel )
public void addBindingExpr( String groupKey, Map resultsExprMap, int groupLevel )
	void addBindingExpr( String groupKey, Map resultsExprMap, int groupLevel )	{		if ( resultsExprMap == null )			return;				Context cx = Context.enter( );		try		{			if ( groupKey != null )			{				CompiledExpression ce = ExpressionCompilerUtil.compile( groupKey,						cx );				if ( ce instanceof ColumnReferenceExpression )				{					ColumnReferenceExpression cre = ( (ColumnReferenceExpression) ce );					groupKey = cre.getColumnName( );				}			}						bindingExprs.add( new GroupBindingColumn( groupKey,					groupLevel,					resultsExprMap ) );		}		finally		{			Context.exit( );		}	}