Bug 153507 Bogus error when bad data set column referenced in group key
Run attached report design. Its group key binding column, "groupkey", is defined to refer to a non-existing data set column: dataSetRow["bad"]. However the actual error seen when previewing the report in BIRT designer: Table (id = 6): + A BIRT exception occurred: Error evaluating Javascript expression. Script engine error: TypeError: valueOf is not a function. Script source: null, line: 0, text: <compiled script>. See next exception for more information. Error evaluating Javascript expression. Script engine error: TypeError: valueOf is not a function. Script source: null, line: 0, text: <compiled script> This error is completely irrelevant to the actual cause of the problem.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
* Prepare Executor so that it is ready to execute the query
	 * 
	 * @param outerRts
	 * @param targetScope
	 * @throws DataException
	 */
	void prepareExecution( IQueryResults outerRts, Scriptable targetScope )
			throws DataException
	{
		if ( isPrepared )
			return;
		this.parentScope = targetScope;
		dataSource = findDataSource( );
		if ( outerRts != null )
		{
			outerResults = ( (IQueryService) outerRts );
			if ( outerResults.isClosed( ) )
			{
				
				throw new DataException( ResourceConstants.RESULT_CLOSED );
			}
			this.nestedLevel = outerResults.getNestedLevel( );
			
			IExecutorHelper helper = outerResults.getExecutorHelper( );
			this.setParentExecutorHelper( helper );
		}
		
		
		
		dataSet = newDataSetRuntime( );