SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function like (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'a\'
        Literal \'Enum(\\\'a\\\' = 1)\'
      Function randomString (children 1)
       ExpressionList (children 1)
        Literal UInt64_0
