Bug 139365 The result of grouping is wrong
Description: The result of grouping is wrong. Step to reproduce: Steps to reproduce: 1. New a report. 2. Create a data source and a data set based on the report. 3. Drag the dataset to the layout, and set two groups on the table. The first level group information: Group key: CITY Interval type: prefix Range: 1 The second level group information: Group key: CUSTOMERNUMBER Interval type: Interval Range: 4 4. Save and preview. (Please refer to the attached design file) Actual result: The result of grouping is wrong. Expected result: In the second level group, the CUSTOMERNUMBER 157, 303, 357, 323 shouldnt in a group. They must be regard as single group according to the conditional of the second level group.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
{
    		dataSet.afterClose();
		}
	    catch (DataException e )
		{
			logger.logp( Level.FINE,
						QueryExecutor.class.getName( ),
						"close",
						e.getMessage( ),
						e );
		}
	    dataSet = null;
		dataSource = null;
	    
		logger.logp( Level.FINER,
				QueryExecutor.class.getName( ),
				"close",
				"executor closed " );
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getDataSet()
	 */
	public DataSetRuntime getDataSet( )
	{
		return dataSet;
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getSharedScope()
	 */