SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList (children 1)
      Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 2)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (alias t1) (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 2)
                  Literal UInt64_1 (alias x)
                  Literal UInt64_2 (alias y)
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             Subquery (alias t2) (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 2)
                 ExpressionList (children 2)
                  Literal UInt64_1 (alias xx)
                  Literal UInt64_2 (alias yy)
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    Function numbers (children 1)
                     ExpressionList (children 1)
                      Literal UInt64_555
            TableJoin (children 1)
             Function or (children 1)
              ExpressionList (children 2)
               Function equals (children 1)
                ExpressionList (children 2)
                 Identifier x
                 Identifier xx
               Function equals (children 1)
                ExpressionList (children 2)
                 Identifier y
                 Identifier yy
