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/api/impl/DataExtractionTask.java
addToResultSetList( query, dispName );
			}
			else
			{
				Set keySet = mapDispNameToQuery.keySet();
				Iterator keyIter = keySet.iterator();
				while (keyIter.hasNext()) {
					dispName = (String) keyIter.next();
					query = (IBaseQueryDefinition) mapDispNameToQuery
							.get(dispName);
					addToResultSetList( query, dispName );
				}
			}
		}
		return resultMetaList;
	}
	/*
	 * create IResultSetItem using display name and IResultMetaData 
	 */
	private void addToResultSetList( IBaseQueryDefinition query, 
			String displayName )
	{
		assert query != null;
		assert displayName != null;
		
		ResultMetaData resultMeta = new ResultMetaData(
				getScriptExpressions(query.getRowExpressions()));
		IResultSetItem resultItem = new ResultSetItem(displayName, resultMeta);