SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier x
    Function arrayJoin (children 1)
     ExpressionList (children 1)
      Identifier x
   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 materialize (alias x) (children 1)
            ExpressionList (children 1)
             Function array (children 1)
              ExpressionList (children 3)
               Literal Tuple_(UInt64_1, UInt64_2)
               Literal Tuple_(UInt64_3, UInt64_4)
               Literal Tuple_(UInt64_5, UInt64_6)
