Bug 193296 Subquery does not return value for chart
I've tried 2.1.x and 2.2RC but I get always an error. org.eclipse.birt.report.engine.data.dte.DataGenerationEngine doExecuteQuery SEVERE: Data engine operation failed due to an unexpected exception. Error evaluating Javascript expression. Script engine error: TypeError: Cannot read property "ISO_LAND" from null Script source: source, line: 0, text: row._outer["ISO_LAND"] + Result iterator has no current row. It either has not started or has ended. I would like to build a report based on a query that returns a list of countries eg.: report_query=select country_id from ... where sales>100 for each country I'd like to have a line chart with sales vs. budget eg.: sub_query= select month,bud,sales from ... where country = ? If I drag the subquery into the "main" table, connect parameter to row[]. no problem. I get bud vs. sales values for each country. If I place a chart based on sub_query in the "main" table. I get the error shown above. In this case I have to connect the parameter to row._outer[] and for some reason I don't see any values in the chart preview?!?
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
public final String[] getPreviewHeader( ) throws ChartException
	{
		Iterator iterator = ReportItemUIUtil.getColumnDataBindings( itemHandle );
		ArrayList list = new ArrayList( );
		while ( iterator.hasNext( ) )
		{
			list.add( ( (ComputedColumnHandle) iterator.next( ) ).getName( ) );
		}
		return (String[]) list.toArray( new String[list.size( )] );
	}
	public final List getPreviewData( ) throws ChartException
	{
		return getPreviewRowData( getPreviewHeader( true ), -1, true );
	}
	private String[] getPreviewHeader( boolean isExpression )
			throws ChartException
	{
		String[] exps = getPreviewHeader( );
		if ( isExpression )
		{
			for ( int i = 0; i < exps.length; i++ )
			{
				exps[i] = ChartUIUtil.getExpressionString( exps[i] );
			}
		}
		return exps;
	}
	protected final List getPreviewRowData( String[] columnExpression,
			int rowCount, boolean isStringType ) throws ChartException
	{