SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function coalesce (alias x) (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal UInt64_2
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x
