SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier _shard_num
    Identifier key
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function remote (children 1)
       ExpressionList (children 3)
        Literal \'127.0.0.1\'
        Function currentDatabase (children 1)
         ExpressionList
        Identifier dist_2
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier _shard_num
    OrderByElement (children 1)
     Identifier key
   Set