Execution example::

  > column_create --table Site --name link --type Site
  [[0,1317212792.88872,0.060705006],true]
  > load --table Site
  > [{"_key":"http://example.org/","link":"http://example.net/"}]
  [[0,1317212793.14984,0.200481934],1]
  > select --table Site --output_columns _key,title,link._key,link.title --query title:@this
  [[0,1317212793.55084,0.000485897],[[[1],[["_key","ShortText"],["title","ShortText"],["link._key","ShortText"],["link.title","ShortText"]],["http://example.org/","This is test record 1!","http://example.net/","test record 2."]]]]