Bug 141950 Selection of select value in data set filter is error
Details: Selection of select value in data set filter is error Step: 1.New a report design. 2.Create a sample datasource and dataset. 3.Switch to filter. 4.Select a value in expression. 5.Drop the list of the value1 and select <select value...> Actual result: No value is appear and pop up an error. It said that "An expression has not been set"
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
return execute( dataSet,
							queryDefn,
							useColumnHints,
							useFilters );
				}
			}
		}
		saveResultToDataItems( dataSet, resultSet );
		return resultSet;
	}
	
	/**
	 * 
	 * @param session
	 * @param queryDefn
	 * @return
	 * @throws BirtException
	 */
	private IQueryResults executeQuery( DataRequestSession session,
			QueryDefinition queryDefn ) throws BirtException
	{
		IQueryResults resultSet = session.executeQuery( queryDefn,
				null,
				null,
				null );
		return resultSet;
	}
	
	/**
	 *