Execution example::

  dump
  # plugin_register sharding
  # 
  # table_create Logs_20160318 TABLE_NO_KEY
  # column_create Logs_20160318 timestamp COLUMN_SCALAR Time
  # 
  # load --table Logs_20160318
  # [
  # ["_id","timestamp"],
  # [1,1458228600.0]
  # ]
