發送短信 : EFFICIENT OLAP FOR BIG DATA

            _____    _    _      ___              
    ___    |  ___|| | || | ||   / _ \\    ____    
   /   ||  | ||__   | || | ||  | / \ ||  |    \\  
  | [] ||  | ||__   | \\_/ ||  | \_/ ||  | [] ||  
   \__ ||  |_____||  \____//    \___//   |  __//  
    -|_||  `-----`    `---`     `---`    |_|`-`   
     `-`                                 `-`