lib/primitive.js
function groupby (args) {
    if (this.typecheck) t.typecheck('groupby', [args]);
    if ('string'===typeof args) args = [args];
    return 'group by '+args.join();
}
function groupby (args) {
    if (this.typecheck) t.typecheck('groupby', [args]);
    if ('string'===typeof args) args = [args];
    return 'group by '+args.join();
}
function groupby ( args ) { if ( this . typecheck ) t . typecheck ( 'groupby' , [ args ] ) ; if ( 'string' === typeof args ) args = [ args ] ; return 'group by ' + args . join ( ) ; }
group by arg1,arg2 ...
group by arg1 arg2 ...