SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier res
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Function arrayJoin (alias res) (children 1)
            ExpressionList (children 1)
             Identifier x
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 2)
                SelectQuery (children 1)
                 ExpressionList (children 1)
                  Literal Array_[UInt64_1, UInt64_2, UInt64_3] (alias x)
                SelectQuery (children 1)
                 ExpressionList (children 1)
                  Literal Array_[Float64_nan, NULL]
          ExpressionList (children 1)
           OrderByElement (children 1)
            Identifier res
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier res
