Bug 122869 Drag a parameter from data explorer view into a table in library, a new parameter is created automatically.
Description:Drag a parameter from data explorer view into a table in library, a new parameter is created automatically. Steps to reproduce: 1. Add a cascading parameter and a table in a library file. 2. Drag a parameter from data explorer view into a table cell in layout editor. 3. Find that a new parameter was added in data explorer view automatically.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/ExpressionTreeSupport.java
{
					"==", Messages.getString( "ExpressionProvider.Operator.Equals" ) 
			},
			{
					"<", Messages.getString( "ExpressionProvider.Operator.Less" ) 
			},
			{
					"<=",
					Messages.getString( "ExpressionProvider.Operator.LessEqual" )  
			},
			{
					"!=",
					Messages.getString( "ExpressionProvider.Operator.NotEqual" )  
			},
			{
					">", Messages.getString( "ExpressionProvider.Operator.Greater" ) 
			},
			{
					">=",
					Messages.getString( "ExpressionProvider.Operator.GreaterEquals" ) 
			}
	};
	
	private static final String[][] OPERATORS_COMPUTATIONAL = new String[][]{
			{
					"+", Messages.getString( "ExpressionProvider.Operator.Add" ) 
			},
			{
					"-", Messages.getString( "ExpressionProvider.Operator.Sub" ) 
			},