SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function icebergBucket (children 1)
     ExpressionList (children 2)
      Literal UInt64_5
      Function toDateTime64 (children 1)
       ExpressionList (children 3)
        Literal \'2017-11-16T22:31:08.000001\'
        Literal UInt64_6
        Literal \'UTC\'
