private static boolean isAliasToken(TSourceToken token) {
   int dbObjType = token.getDbObjType();
   if (dbObjType != TObjectName.ttobjColumnAlias
       && dbObjType != TObjectName.ttObjTableAlias
       && dbObjType != TObjectName.ttobjAliasName) {
     return false;
   }
   return true;
 }