Bug 151794 Integer data can't be retrieved in dynamic parameter
Steps to reproduce: 1.New a sample data source and a data set from table "CUSTOMERS" 2.New a dynamic parameter, choose data type "Integer" Expected result: Those integer data set columns are listed in "Select value column" Actual result: No column available
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
{
				canBeNull = ( (Boolean) dirtyProperties.get( CHECKBOX_ALLOW_NULL ) ).booleanValue( );
			}
			else
			{
				canBeNull = inputParameter.allowNull( );
			}
		}
		return canBeNull;
	}
	private boolean isDefaultChoice( SelectionChoice choice )
	{
		String choiceValue = choice.getValue( );
		String defaultValue = convertToStandardFormat( this.defaultValue );
		if ( choice != dummyChoice )
		{
			if ( canBeNull( ) && choiceValue == null && defaultValue == null )
			{
				return true;
			}
			return choiceValue != null && isEqual( choiceValue, defaultValue );
		}
		return false;
	}
	private boolean isStatic( )
	{
		return staticRadio.getSelection( );
	}
	private String convertToStandardFormat( String string )
	{