Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
eventHandler.setExecutorHelper( helper );
		
		odiResult = executeOdiQuery( eventHandler );
		helper.setJSRowObject( this.dataSet.getJSResultRowObject( ) );
		
		resetComputedColumns( );
		
		this.dataSet.setResultSet( odiResult, false );
		
		
		
		this.isExecuted = true;
		logger.logp( Level.FINER,
				QueryExecutor.class.getName( ),
				"execute",
				"Finish executing" );
	}
	/**
	 * reset computed columns
	 */
	private void resetComputedColumns( )
	{
		List l = this.getDataSet( ).getComputedColumns( );
		if ( l != null )
			l.removeAll( this.temporaryComputedColumns );
	}
	/*
	 * Closes the executor; release all odi resources
	 *