SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function format (children 1)
       ExpressionList (children 4)
        Literal \'{}{}{}\'
        Literal \'a\'
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Literal \'b\'
          Literal UInt64_1
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal \'c\'
      Literal \'abc\'