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
{
				switch ( action.getActionType( ) )
				{
					case ActionDesign.ACTION_BOOKMARK :
						addExpression( action.getBookmark( ) );
						break;
					case ActionDesign.ACTION_DRILLTHROUGH :
						DrillThroughActionDesign drillThrough = action
								.getDrillThrough( );
						if ( drillThrough != null )
						{
							addExpression( drillThrough.getBookmark( ) );
							if ( drillThrough.getParameters( ) != null )
							{
								Iterator ite = drillThrough.getParameters( )
										.entrySet( ).iterator( );
								while ( ite.hasNext( ) )
								{
									Map.Entry entry = (Map.Entry) ite.next( );
									assert entry.getValue( ) instanceof Expression;
									addExpression( (Expression) entry
											.getValue( ) );
								}
							}
						}
						break;
					case ActionDesign.ACTION_HYPERLINK :
						addExpression( action.getHyperlink( ) );
						break;
					default :