Bug 177439 Need an easy way to determine default value for a dynamic parameter
Currently, I have to bring up the data set editor, preview the results in the data set and make a mental note of the value to use for a report parameter that depends on a data set. It would be nice to have a drop down on the default value field, such as <Select value> which when selected queries the data set and presents me with a list to select from.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
{
		CachedMetaDataHandle cmdh = null;
		try
		{
			DataSetHandle dataSet = getDataSet( handle );
			if ( dataSet == null )
			{
				return null;
			}
			cmdh = DataSetUIUtil.getCachedMetaDataHandle( dataSet );
		}
		catch ( SemanticException e )
		{
		}
		String value = null;
		if ( COLUMN_VALUE.equals( column ) )
		{
			value = handle.getValueExpr( );
		}
		else
		{
			value = handle.getLabelExpr( );
		}
		if ( cmdh != null )
		{
			for ( Iterator iter = cmdh.getResultSet( ).iterator( ); iter.hasNext( ); )
			{
				ResultSetColumnHandle element = (ResultSetColumnHandle) iter.next( );
				if ( DEUtil.getColumnExpression( element.getColumnName( ) )
						.equalsIgnoreCase( value ) )