Bug 142939 Invalid interval will cause incorrect group action.
Description: Invalid interval will cause incorrect group action. Steps to reproduce: 1. Insert a list 2. Add a group, key is string type column, set interval to year, range to 3 3. Preview Expected result: Error msg about invald interval and ignore the invalid interval. Actual result: No error msg and only return one group with all datarows.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
{
			return new ResultMetaData( ( (JointDataSetQuery) odiQuery ).getResultClass( ) );
		}
		else
		{
			return new ResultMetaData( ( (ICandidateQuery) odiQuery ).getResultClass( ) );
		}
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#execute()
	 */
	public void execute( IEventHandler eventHandler ) throws DataException
	{
		logger.logp( Level.FINER,
				QueryExecutor.class.getName( ),
				"execute",
				"Start to execute" );
		if ( this.isExecuted )
			return;
		ExecutorHelper helper = new ExecutorHelper( this.queryScope );
		helper.setParent( this.parentHelper );
		eventHandler.setExecutorHelper( helper );
		
		odiResult = executeOdiQuery( eventHandler );
		
		helper.setJSRowObject( this.dataSet.getJSResultRowObject( ) );
		resetComputedColumns( );
		
		this.dataSet.setResultSet( odiResult, false );