SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 2)
      Literal \'2002-12-12 23:23:23.123\'
      Literal UInt64_3
    Function toString (children 1)
     ExpressionList (children 1)
      Identifier dt64
   Set
