SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal UInt64_1 (alias a)
   ExpressionList (children 1)
    Subquery (children 1)
     SelectWithUnionQuery (children 1)
      ExpressionList (children 1)
       SelectQuery (children 2)
        ExpressionList (children 1)
         Asterisk
        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 1)
                TablesInSelectQueryElement (children 1)
                 TableExpression (children 1)
                  Subquery (children 1)
                   SelectWithUnionQuery (children 1)
                    ExpressionList (children 1)
                     SelectQuery (children 1)
                      ExpressionList (children 1)
                       Function plus (children 1)
                        ExpressionList (children 2)
                         Identifier a
                         Literal UInt64_1