Bug 122854 There is redundant columns in "available columns" list in "export data" dialog.
Description: There is redundant columns in "available columns" list in "export data" dialog. Steps to reproduce: 1. Preview attached design in web viewer. 2. Select the table and click on "export" button. 3. There is a "detail" column name in "available columns" list which is not data set column.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
*         return the default value
		 */
		protected String getLocalizedString( String resourceKey, String text )
		{
			if ( resourceKey == null )
			{
				return text;
			}
			String ret = report.getMessage( resourceKey, context.getLocale( ) );
			if ( ret == null )
			{
				logger.log( Level.SEVERE, "get resource error, resource key:" 
						+ resourceKey + " Locale:" 
						+ context.getLocale( ).toString( ) );
				return text;
			}
			return ret;
		}
		/**
		 * Walk through the DOM tree from a text item to collect the embedded
		 * expressions and format expressions
		 * 
		 * After evaluating, the second child node of the embedded expression
		 * node holds the value if no error exists.
		 * 
		 * @param node
		 *            a node in the DOM tree
		 * @param text
		 *            the text object
		 */