Use sp_drv_unitext_locator_charlength to find the character length
      of a LOB column referenced by a unitext locator.
        sp_drv_unitext_locator_charlength accesses the Transact-SQL function
        char_length.
Syntax
        
        
          sp_drv_unitext_locator_charlength locator, data_length
         
       
Input Parameters
        
        locator – a unitext_locator that references the
            unitext column to manipulate.
       
Output Parameters
        
        data_length – an integer specifying the character
          length of the unitext column referenced by
          locator.