Bug 118780 Set alias for columns in data set but in expression builder still shows the old columns name when select the dataset.
Description: Set alias for columns in data set but in expression builder still shows the old columns name when select the dataset. Steps to reproduce: 1. New a datasource and a dataset 2. Set alias of the first column in the dataset to "column1". 3. Insert a data item and bind it to dataset. 4. In the expression builder, select the dataset and double click the first column name. Expected result: According to scr #78193 in tracker, the first column in expression build should use alias name instead of original name. Actual result: The original name of the first column was listed in the below of expression builder but the alias name appeared above as row["column1"] after double click the original name.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionProvider.java
"-", 
			"*", 
			"/", 
			OPERATOR_SEPARATOR, "!", 
			"=", 
			"<", 
			">", 
			OPERATOR_SEPARATOR, "&", 
			"|", 
			"(", 
			")" 
	};
	
	private static final Operator[] OPERATORS_ASSIGNMENT = new Operator[]{
			new Operator( "=", "ExpressionProvider.Operator.Assign" ), 
			new Operator( "+=", "ExpressionProvider.Operator.AddTo" ), 
			new Operator( "-=", "ExpressionProvider.Operator.SubFrom" ), 
			new Operator( "*=", "ExpressionProvider.Operator.MultTo" ), 
			new Operator( "/=", "ExpressionProvider.Operator.DividingFrom" ), 
	};
	
	private static Operator[] OPERATORS_COMPARISON = new Operator[]{
			new Operator( "==", "ExpressionProvider.Operator.Equals" ), 
			new Operator( "<", "ExpressionProvider.Operator.Less" ), 
			new Operator( "<=", "ExpressionProvider.Operator.LessEqual" ),  
			new Operator( "!=", "ExpressionProvider.Operator.NotEqual" ),  
			new Operator( ">", "ExpressionProvider.Operator.Greater" ), 
			new Operator( ">=", "ExpressionProvider.Operator.GreaterEquals" ), 
	};