Execution example::

  column_create --table Terms --name blog_title --flags COLUMN_INDEX|WITH_POSITION --type Site --source title
  # [
  #   [
  #     -22, 
  #     1337566253.89858, 
  #     0.000355720520019531, 
  #     "already used name was assigned: <Terms.blog_title>", 
  #     [
  #       [
  #         "grn_obj_register", 
  #         "db.c", 
  #         6572
  #       ]
  #     ]
  #   ], 
  #   false
  # ]
