anchor.diff:        K_UPDATE IDENT
             (K_USING K_CONSISTENCY '.' K_LEVEL { cLevel = ConsistencyLevel.valueOf($K_LEVEL.text); })?
             K_WITH first=rowDef { $expr = new UpdateStatement($IDENT.text, first, cLevel); }
  -          (K_AND next=rowDef { $expr.and(next); })* ';'
  +          (K_AND next=rowDef { $expr.and(next); })* endStmnt
       ;
   
   // TODO: date/time, utf8
  
positive.code:                       numColumns = count;
                }
            )*
            order=(K_ASC | K_DESC { reversed = true; })? ';'
        {
            return new SelectStatement($IDENT.text,
                                       cLevel,
  
negative.code: 
  // USE <KEYSPACE>;
  useStatement returns [String keyspace]
      : K_USE IDENT { $keyspace = $IDENT.text; } endStmnt
      ;
  
  /**
  