SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 2)
        Function materialize (children 1)
         ExpressionList (children 1)
          Function toLowCardinality (children 1)
           ExpressionList (children 1)
            Literal \'1\'
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal \'2\'