Bug 145478 Unable "Select Value" in the Join data set's filter
Step to reproduce: 1.new a join data set(please use the attached file) 2.right click the dataset and click the Edit 3.go to the Filter pane and set a filer 4.click the list of Value1 Actual result: A warning pop up and cant select Value.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
if ( resultIter != null )
						{
							while ( resultIter.hasNext( ) )
							{
								ResultSetColumnHandle column = (ResultSetColumnHandle) resultIter.next( );
								if ( column.getPosition( ).intValue( ) == n + 1 )
								{
									columnName = column.getColumnName( );
									break;
								}
							}
						}
						if ( columnName == null )
						{
							columnName = ""; 
						}
						columns[n].setName( columnName );
					}
					if ( columns[n].getName( ).equals( hint.getColumnName( ) ) )
					{
						columns[n].setDisplayName( hint.getDisplayName( ) );
						columns[n].setAlias( hint.getAlias( ) );
						columns[n].setHelpText( hint.getHelpText( ) );
						break;
					}
				}
			}
		}
	}
	/**