SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias foo) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Literal NULL (alias a)
           Literal UInt64_1 (alias b)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias bar) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1024 (alias b)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Identifier bar.b
