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
else
			{
				pushExpressions( query.getBeforeExpressions( ) );
				handleReportItemExpressions( table );
				handleTableBand( table.getHeader( ), value );
				popExpressions( );
				SlotHandle groupsSlot = ( (TableHandle) table.getHandle( ) )
						.getGroups( );
				for ( int i = 0; i < table.getGroupCount( ); i++ )
				{
					handleTableGroup( table.getGroup( i ),
							(GroupHandle) groupsSlot.get( i ), value );
				}
				if ( table.getDetail( ).getRowCount( ) != 0 )
				{
					query.setUsesDetails( true );
				}
				pushExpressions( query.getRowExpressions( ) );
				handleTableBand( table.getDetail( ), value );
				popExpressions( );
				pushExpressions( query.getAfterExpressions( ) );
				handleTableBand( table.getFooter( ), value );
				popExpressions( );
			}
			finishVisit( query );
			registerQueryAndElement( query, table );
			return value;
		}
		
		/*