Bug 182296 Crosstab - non-numeric measures
Feature request. Looking at the 2.2.M6 release, it seems that measures (the fields that can be in the matrix part of the output) need to be numeric. I looked at the spec documents and it seems there is no requirement for non-numeric measures
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/util/DiskIndex.java
/**
	 * 
	 * @param documentManager
	 * @param name
	 * @param granularity
	 * @param keyList
	 * @throws IOException
	 * @throws DataException 
	 */
	DiskIndex( IDocumentManager documentManager, String name, int granularity,
			IDiskArray keyList, boolean isSorted ) throws IOException, DataException
	{
		this.name = name;
		this.degree = granularity;
		this.documentManager = documentManager;
		produce( keyList, isSorted );
	}
	/**
	 * 
	 * @param documentManager
	 * @param name
	 * @throws IOException
	 * @throws DataException 
	 */
	DiskIndex( IDocumentManager documentManager, String name )
			throws IOException, DataException
	{
		this.name = name;
		this.documentManager = documentManager;
		loadFromDisk( );