Execution example::

  > table_create --name Type --flags TABLE_HASH_KEY --key_type ShortText
  [[0,1317212791.02322,0.03942904],true]
  > column_create --table Type --name number --type Int32
  [[0,1317212791.26314,0.124383285],true]
  > column_create --table Type --name float --type Float
  [[0,1317212791.58803,0.027924039],true]
  > column_create --table Type --name string --type ShortText
  [[0,1317212791.81654,0.040399047],true]
  > column_create --table Type --name time --type Time
  [[0,1317212792.05751,0.027354067],true]
  > load --table Type
  > [{"_key":"sample","number":12345,"float":42.195,"string":"GROONGA","time":1234567890.12}]
  [[0,1317212792.28516,0.200775839],1]
  > select --table Type
  [[0,1317212792.68655,0.000199477],[[[1],[["_id","UInt32"],["_key","ShortText"],["time","Time"],["string","ShortText"],["number","Int32"],["float","Float"]],[1,"sample",1234567890.12,"GROONGA",12345,42.195]]]]