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
results.close( );
					}
					
					columns = (DataSetViewData[]) htColumns.get( dataSet );
				}
			}
			catch ( BirtException e )
			{
				if ( !suppressErrorMessage )
				{
					ExceptionHandler.handle( e );
				}
			}
		}
		
		
		if ( columns == null )
		{
			columns = new DataSetViewData[]{};
			updateModel( dataSet, columns );
			htColumns.put( dataSet, columns );
		}
		return columns;
	}
	/**
	 * @param dataSet
	 * @return
	 */
	private final DataSetViewData[] getCachedColumns( DataSetHandle dataSet )
	{