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 map from query to report item design
	 * 
	 * @return the map from query to report item design
	 */
	public HashMap getQueryToReportItemMap( )
	{
		return mapQueryToReportItem;
	}
	/**
	 * @param report
	 *            the entry point to the report design
	 * @param context
	 *            the execution context
	 */
	public void build( Report report, ExecutionContext context )
	{
		new QueryBuilderVisitor( ).buildQuery( report, context );
	}
	/**
	 * The visitor class that actually builds the report query
	 */
	protected class QueryBuilderVisitor extends DefaultReportItemVisitorImpl
	{
		/**
		 * query and it's IDs
		 */