how to create an inverted index in HANA

Hi everyone,

     how can i  create an inverted index on a column stored table? I have tried the following command,

         create column table foo(

               A varchar(20),

               B varchar(20),

               primary key (A,B) using inverted hash

          )

     but it doesn't work,

     do I miss something?

     thanks for the help.

zhongcun