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
aggregates = new AggregateCalculator( this.aggrTable, odiResult );
		
		aggregates.calculate( getQueryScope( ) );
		this.isExecuted = true;
		logger.logp( Level.FINER,
				QueryExecutor.class.getName( ),
				"execute",
				"Finish executing" );
	}
	private void resetComputedColumns( )
	{
		List l = this.getDataSet( ).getComputedColumns( );
		if ( l != null )
			l.removeAll( this.temporaryComputedColumns );
	}
	/*
	 * Closes the executor; release all odi resources
	 * 
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#close()
	 */
	public void close( )
	{
		if ( odiQuery == null )
		{
			
			logger.logp( Level.FINER,
					QueryExecutor.class.getName( ),
					"close",
					"executor closed " );
			return;