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
if ( selectionMark[k] )
					{
						if ( selections[k].isSelected( indexKey.key ) )
						{
							resultList.add( indexKey );
							break;
						}
					}
				}
			}
		}
		return resultList;
	}
	
	/**
	 * 
	 * @param n
	 * @return
	 * @throws IOException
	 */
	public IDiskArray topN( int n ) throws IOException
	{
		BufferedStructureArray resultList = new BufferedStructureArray( IndexKey.getCreator( ),
				Math.min( n, Constants.MAX_LIST_BUFFER_SIZE ) );
		offsetDocumentObject.seek( ( keyCount - n ) * 4 );
		documentObject.seek( offsetDocumentObject.readInt( ) );
		for ( int i = 0; i < n; i++ )
		{
			resultList.add( readKeyObject( ) );
		}