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 ( offsetDocumentObject == null )
		{
			offsetDocumentObject = documentManager.openDocumentObject( getOffsetDocName( name ) );
			documentObject.seek( 0 );
		}
	}
	/**
	 * 
	 * @return
	 * @throws IOException
	 */
	private int saveIndexHeader( ) throws IOException
	{
		documentObject.writeInt( keyDataType.length );
		for ( int i = 0; i < keyDataType.length; i++ )
		{
			documentObject.writeInt( keyDataType[i] );
		}
		documentObject.writeInt( keyCount );
		documentObject.writeInt( degree );
		byte[] b = new byte[6];
		documentObject.write( b, 0, 6 );
		return (int) ( documentObject.getFilePointer( ) );
	}
	/**
	 * 
	 * @param sortedKeyArray
	 * @param interval
	 * @return
	 * @throws IOException