Execution example::

  table_create --name SiteDomain --flags TABLE_HASH_KEY --key_type ShortText
  # [
  #   [
  #     -22, 
  #     1337566253.89858, 
  #     0.000355720520019531, 
  #     "already used name was assigned: <SiteDomain>", 
  #     [
  #       [
  #         "grn_obj_register", 
  #         "db.c", 
  #         6572
  #       ]
  #     ]
  #   ], 
  #   false
  # ]
  table_create --name SiteCountry --flags TABLE_HASH_KEY --key_type ShortText
  # [
  #   [
  #     -22, 
  #     1337566253.89858, 
  #     0.000355720520019531, 
  #     "already used name was assigned: <SiteCountry>", 
  #     [
  #       [
  #         "grn_obj_register", 
  #         "db.c", 
  #         6572
  #       ]
  #     ]
  #   ], 
  #   false
  # ]
  column_create --table Site --name domain --flags COLUMN_SCALAR --type SiteDomain
  # [
  #   [
  #     -22, 
  #     1337566253.89858, 
  #     0.000355720520019531, 
  #     "already used name was assigned: <Site.domain>", 
  #     [
  #       [
  #         "grn_obj_register", 
  #         "db.c", 
  #         6572
  #       ]
  #     ]
  #   ], 
  #   false
  # ]
  column_create --table Site --name country --flags COLUMN_SCALAR --type SiteCountry
  # [
  #   [
  #     -22, 
  #     1337566253.89858, 
  #     0.000355720520019531, 
  #     "already used name was assigned: <Site.country>", 
  #     [
  #       [
  #         "grn_obj_register", 
  #         "db.c", 
  #         6572
  #       ]
  #     ]
  #   ], 
  #   false
  # ]
  load --table Site
  [
  {"_key":"http://example.org/","domain":".org","country":"japan"},
  {"_key":"http://example.net/","domain":".net","country":"brazil"},
  {"_key":"http://example.com/","domain":".com","country":"japan"},
  {"_key":"http://example.net/afr","domain":".net","country":"usa"},
  {"_key":"http://example.org/aba","domain":".org","country":"korea"},
  {"_key":"http://example.com/rab","domain":".com","country":"china"},
  {"_key":"http://example.net/atv","domain":".net","country":"china"},
  {"_key":"http://example.org/gat","domain":".org","country":"usa"},
  {"_key":"http://example.com/vdw","domain":".com","country":"japan"}
  ]
  # [[0, 1337566253.89858, 0.000355720520019531], 9]
